imagelayereffect

Last updated: Sat, 24 Mar 2007

imagejpeg

(PHP 4, PHP 5)

imagejpeg — Output image to browser or file

Popis

bool imagejpeg ( resource $image [, string $filename [, int $quality]] )

imagejpeg() creates a JPEG file from the given image.

Seznam parametrů

image

An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().

filename

The path to the saved file. If not set or NULL, the raw image stream will be outputed directly.

To skip this argument in order to provide the quality parameter, use NULL.

quality

quality is optional, and ranges from 0 (worst quality, smaller file) to 100 (best quality, biggest file). The default is the default IJG quality value (about 75).

Návratové hodnoty

Vrací TRUE při úspěchu, FALSE při selhání.

Poznámky

Poznámka: Podpora formátu JPEG je k dispozici jen v případě, že bylo PHP zkompilováno s GD-1.8 nebo novější.

Poznámka: If you want to output Progressive JPEGs, you need to set interlacing on with imageinterlace().

Viz také

imagelayereffect

Last updated: Sat, 24 Mar 2007

add a note User Contributed Notes
imagejpeg

lorezyra (at) lorezyra (dot) com
13-Sep-2008 07:57


I noticed through testing that my previous function would not always return the data requested... this is due to the fact that some cameras and software dont correctly write the DPI info in the JFIF header... So, my 2nd solution is to read the exif info (if available) and output the first non-zero value as the DPI...



<?PHP

function getJPEGresolution($filename){

    if(exif_imagetype( $filename)!= IMAGETYPE_JPEG) return(false);

    $outRez=array();

    // Read the file

    $exif = exif_read_data($filename, 'IFD0');

    

    ob_start(); // start a new output buffer

    $image   = file_get_contents($filename);

    

    // grab DPI information from the JPG header

    $outRez["xDPI"] = (int)(ord($image[15])>0? ord($image[15]) : $exif['XResolution'] );

    $outRez["yDPI"] = (int)(ord($image[17])>0? ord($image[17]) : $exif['YResolution'] );

    ob_end_clean(); // stop this output buffer



    //correct output if header doesn't contain dpi info:: use exif info instead

    $outRez["xDPI"] = ($outRez["xDPI"]>0? $outRez["xDPI"] : $exif['THUMBNAIL']['XResolution'] );

    $outRez["yDPI"] = ($outRez["yDPI"]>0? $outRez["yDPI"] : $exif['THUMBNAIL']['YResolution'] );

    

    //double check values; make sure it's just a number and not "72/1" ...

    if(!is_numeric($outRez["xDPI"])) $outRez["xDPI"] = (int)substr($outRez["xDPI"], 0, strpos($outRez["xDPI"],"/",1));

    if(!is_numeric($outRez["yDPI"])) $outRez["yDPI"] = (int)substr($outRez["yDPI"], 0, strpos($outRez["yDPI"],"/",1));



    //xDPI and yDPI should equal in value... but we output both anyway...

    return($outRez);

}//end function getJPEGresolution

?>

lorezyra (at) lorezyra (dot) com
13-Sep-2008 06:50


For those looking to grab the resolution of a JPEG image without using GD nor ImageMagic... I wrote this simple function.



Too bad GD doesn't have this very simple function for us to use...



<?php

function getJPEGresolution($filename){

    $outRez=array();

    // Read the file

    ob_start(); // start a new output buffer

    $image   = file_get_contents($filename);

    

    // grab DPI information from the JPG header

    $outRez["xDPI"] = ord($image[15]);

    $outRez["yDPI"] = ord($image[17]);

    ob_end_clean(); // stop this output buffer



    //xDPI and yDPI should equal in value... but we output both anyway...

    return($outRez);

}//end function getJPEGresolution

?>

stefan at colulus dot com
30-May-2008 11:16


I worked out a script that allows the transfer of alphanumeric data to be placed on an image. The HTML feature is img src and the php feature is imagettftext. This simple code will increment from 1 to 3 on images.



code:



<?php

//ImageCall.php -- This script will call a script to produce the image.

for($next = 1;$next < 4; $next++){

print "Image $next:<br>";

print "<img src = 'Image.php?\$text=$next'>";

print "<br><br>";

}

?>



<?php

//Image.php -- This script creates a square image and places the text on it.



// image size and color

$im = ImageCreate(77,77);

$color1 = ImageColorAllocate($im,0x66,0xCC,0x00);

$color2 = ImageColorAllocate($im,0x33,0x66,0x00);

$color3 = ImageColorAllocate($im,0x00,0x99,0x00);

$color4 = ImageColorAllocate($im,0x3D,0x3D,0x3D);



// image creation

ImageFilledRectangle($im,1,1,76,76,$color1);

ImageFilledpolygon($im, array (76,1,1,76,76,76),3,$color2);

ImageFilledRectangle($im,5,5,72,72,$color3);



// determine numeric center of image

$size = ImageTTFBBox(45,0,'impact',$_GET['$text']);

$X = (77 - (abs($size[2]- $size[0])))/2;

$Y = ((77 - (abs($size[5] - $size[3])))/2 + (abs($size[5] - $size[3])));



//places numeric information on image

ImageTTFText($im,45,0,($X-1),$Y,$color4,'impact',$_GET['$text']);



//returns completed image to calling script

Header('Content-Type: image/png');

Imagejpeg($im);



?>

xavi at lapalomera dot com
21-May-2008 11:11


For those whom needs other dpi image than the GD library, just do the following:



<?php

//Get jpeg image contents

ob_start();

imagejpeg($image, "", 100);

$image = ob_get_contents();

ob_end_clean();



//Or read jpeg image

$image = file_get_contents($file);



//Replace header image info to set DPI as units and the density for X and Y 

//First parameter are units for X and Y densities (0x00 No units, 0x01 DPI, 0x02 DPC)

//Second parameter is the X density

//Third parameter is the Y density

$image = substr_replace($image, pack("Cnn", 0x01, 300, 300), 13, 5);



header("Content-type: image/jpeg");

header('Content-Disposition: attachment; filename="'.basename($file).'"');    



echo $image;

?>

gcc dot programmer at gmail dot com
27-Mar-2008 10:24


The following was developed using Mac OSX ( Linux ).  The ghostscript call would have to be changed on a Windows box...



In an application I was developing, I needed to create .jpg thumbnails from .pdf uploaded files.  After some research, I found one easy way to accomplish this was ( SIMPLIFIED ):



<?php

     exec("sw/bin/gs -q -dNOPAUSE -dBATCH -sDEVICE=jpeg 

              -sOutputFile=test.jpg theFile.pdf");

?>



This of course assumes that ghostscript is installed on the server, you have permissions, yada...



Essentially this calls on ghostscript to do the conversion.



So, then, once the new .jpg is created, it needed to be resized to accomodate the UI.  Though I could easily do it from the command line with "convert", I was having issues using this command from PHP ( it's not my first language ).  I found this thread while groping for a different method, and found an unworkable solution that stimulated me to write the following:



( commented out lines were for debug, but might prove instructional for your own purposes, so I left them in )



[This function takes in a .jpg file to be converted to a thumbnail, the new width you want the thumbnail to be, and the name to which you want the thumbnail saved.  It then creates the thumbnail]



<?php

     function createImage( $upload, $newWidth, $name )

     {

          if (!$info = getimagesize($upload) )

               return false;

          //echo "width: "  . $info[0] . "<br/>";

          //echo "height: " . $info[1] . "<br/>";



          //create crude aspect ratio:

          $aspect = $info[0] / $info[1];

          $newHeight = round( $newWidth/$aspect );

          //echo "$newHeight <br/>";



          $src = @imagecreatefromjpeg("$upload");

          if ( !$src )

               return false;



          $tmp = @imagecreatetruecolor( $newWidth, $newHeight );

          imagecopyresampled( $tmp, $src, 0, 0, 0, 0, $newWidth,

                                         $newHeight, $info[0], $info[1] );



          imagejpeg( $tmp, $name, 100 );

          imagedestroy( $src );

          imagedestroy( $tmp );

          return true;

     }



?>



$upload = the path to the file you want to make a thumbnail from.



$newWidth = the width of your thumbnails.



$name = the path ( including name ) of the thumbnail you're creating.



If I have test.jpg in my servers root directory, and I want a thumbnail

with a width of 120 pixels, with the name thumb.jpg also to be saved

in the servers root directory, I'd call this function thus:



<?php

     createImage("test.jpg", 120, "thumb.jpg");

?>



I hope this makes life easier for somebody.

Anonymous
16-Mar-2008 11:24


Here is a function to resize an image and maintain aspect ratio. It will resize jpeg, gif or png and could easily be modified to add bmp. The name field is the destination of the file minus the file extension:



<?php

//name= filename minus type

    function createImage($uploadedfile,$newWidth,$name) 

    {

        // Capture the original size of the uploaded image

        if(!$info=getimagesize($uploadedfile))

          return false;

        

        switch ($info['mime']) 

        {

            case 'image/jpeg':

                $src = imagecreatefromjpeg($uploadedfile);

                break;

            case 'image/gif':

                $src = imagecreatefromgif($uploadedfile);

                break;

            case 'image/png':

                $src = imagecreatefrompng($uploadedfile);

                break;

            default:

                return false;

        }

        

        //Change the filename to add the filetype

        $mime=split("image/",$info['mime']);

        $filename=$name.".".$mime[1];

        

        $size = getimagesize($uploadedfile);

        $newHeight=aspect_ratio($size[0],$newWidth,$size[1]);

        

        $tmp=imagecreatetruecolor($newWidth,$newHeight);

        

        // this line actually does the image resizing, copying from the original

        // image into the $tmp image

        imagecopyresampled($tmp,$src,0,0,0,0,$newWidth,$newHeight,$info[0], $info[1]);

        

        switch ($info['mime'])

        {

            case 'image/jpeg':

                imagejpeg($tmp,$filename,100); //100 is the quality settings, values range from 0-100.

                break;

            case 'image/gif':

                imagegif($tmp,$filename,100); //100 is the quality settings, values range from 0-100.

                break;

            case 'image/png':

                imagepng($tmp,$filename); //100 is the quality settings, values range from 0-100.

                break;

        }

            

        imagedestroy($src);

        imagedestroy($tmp); // NOTE: PHP will clean up the temp file it created when the request

        // has completed.

        return true;

    }



    if(!createImage($uploadedfile,100, "uploaded_images/imgname"))

    {

      echo "error";

    }

?>

james [at] bellisinasce.it
20-Jan-2008 09:20


When using 



ImageJpeg ($img, "", $qlty) or any other Image*() command, with direct output to browser, BE ABSOLUTELY CERTAIN that your php file does not contain any \r, \n, or white spaces before the <? and after the ?> signs.



This should always kept in mind, not only for the file you are executing BUT ALSO FOR ALL THE INCLUDES called during the file execution!



I got totally crazy about this, for a whole weekend :(

My php editor did not correctly display a \n sign, as I was locally using a different charset/OS.



example



<?

include ("/usr/www.example.com/inc/function.inc.php");

include ("/usr/www.example.com/inc/function.common.php");

connect_db0 ();

$admin_cookie = ckadmin_cookie ();

...

$img = file_get_contents ($path.$_GET['src']);

$im = imagecreatefromstring ($img);

header ("Content-Type: image/jpeg");        

imageJPEG ($im);

imageDestroy ($im);    

...



?>



If any of the included files, for any reason, prints an error message (or simply a warning) or has any white spaces/return/new line chars before "<?" or  after the ">?" signs, the result will be a broken image! 



Even looking inside the defective image, it will be quite difficult to notice the unwanted characters, especially if you are using something like the windows' notepad... X(



If nothing is found, with the file/php editors, and you are not sure about your charset compatibility, I suggest to try to edit directly the files on the server, if possible, and search for all unwanted chars. ;)

pbijl
20-Dec-2007 03:37


note that using a different quality besides the default can result in strange cropping when resizing for example.

Michaelsoft
16-Oct-2007 02:50


I could not find any information on changing the DPI information on a JPG file using the GD lib. Since changing this does not resize or scale the actual image, it is only a header-setting.

The following snipplet will save your $image to $file and set the DPI to 150.



<?php



  imagejpeg($image, $file, 75);



  // Change DPI

  $dpi_x   = 150;

  $dpi_y   = 150;

  

  // Read the file

  $size    = filesize($file);

  $image   = file_get_contents($file);



  // Update DPI information in the JPG header

  $image[13] = chr(1);

  $image[14] = chr(floor($dpi_x/255));

  $image[15] = chr(      $dpi_x%255);

  $image[16] = chr(floor($dpi_y/255));

  $image[17] = chr(      $dpi_y%255);



  // Write the new JPG

  $f = fopen($file, 'w');

  fwrite($f, $msg, $size);

  fclose($f);



?>



P.s. not fully tested (yet) but it works for my images ...

Elliott Brueggeman
30-Jul-2007 09:37


I did an experiment with the image quality parameter of the imagejpeg() function when creating jpegs. I found the optimal image quality with file size is taken into account to be 80 - very close to the default value of 75.



Anything over 80 results in an unnecessary increase in file size without much increase in image quality.



Results and sample pictures: http://www.ebrueggeman.com/article_php_image_optimization.php

write2shadi [at] gmail [dot] com
30-Jul-2007 06:54


after seeking for 2 days why ImageJpeg() was writing an empty file to the server, it was due to insufficient disk space on my hosting plan.... hope this helps,

Pedja (pedja at supurovic dot net)
26-Jul-2007 10:59


Here is sample function that creates thumbnail of source JPEG file. Thumbnail wil be in square form (with and height are the same), and original image cropped to fit in.



Parameters:



$p_thumb_file - name of the file (including path) where thumb should be saved to



$p_photo_file - nam of the source JPEG file (including path) thatthumbnail should be created of



$p_max_size - with and height (they will be the same) in pixels for thumbnail image



$p_quality - quality of jpeg thumbnail



<?php



function photoCreateCropThumb ($p_thumb_file, $p_photo_file, $p_max_size, $p_quality = 75) {

  

    $pic = @imagecreatefromjpeg($p_photo_file);



    if ($pic) {

        $thumb = @imagecreatetruecolor ($p_max_size, $p_max_size) or die ("Can't create Image!");

        $width = imagesx($pic);

        $height = imagesy($pic);

        if ($width < $height) {

                $twidth = $p_max_size;

                $theight = $twidth * $height / $width; 

                imagecopyresized($thumb, $pic, 0, 0, 0, ($height/2)-($width/2), $twidth, $theight, $width, $height); 

        } else {

                $theight = $p_max_size;

                $twidth = $theight * $width / $height; 

                imagecopyresized($thumb, $pic, 0, 0, ($width/2)-($height/2), 0, $twidth, $theight, $width, $height); 

        }



        ImageJPEG ($thumb, $p_thumb_file, $p_quality);

    }



}



?>

Ross
27-Apr-2007 08:58


Just incase its confusing, i forgot to add



        $thumbwidth=70;

        $thumbheight=70;



to the top of the script below!

Ross
27-Apr-2007 07:53


This is a function that I had developed for a CMS.  The idea is that it runs from an upload form. The user uploads a hi-res image, which is copied to the server, a low res one is created (half the width/height of hi res) and a thumbnail is created.



The image is resized matching the smallest side of the image to the thumbnail size (in this example it is 70px).  The other side is then resized proportionally (which will end up being more than 70px) and cropped and centered so that it too is 70px.



There is a mixture of imagecopyresized and imagecopyresampled, i have chosen the ones that work best in this situation but imagecopyresampled gives a much nicer image.



Hope this helps someone.



        $dest_hires = "../images/artistsphotos/".$imageName."h.jpg";

        $dest_lowres = "../images/artistsphotos/".$imageName."l.jpg";

        $dest_thumbnail = "../images/artistsphotos/".$imageName."i.jpg";



        /*upload full size image to site - if it is hi res we do not want to manipulate it

        want to leave all qualit in tact.*/

        move_uploaded_file($_FILES["fileartimg"]["tmp_name"],"$dest_hires");



        $ims = getimagesize($dest_hires); //now we have dimensions of original image...

    

        /******creating lower res image******/

        $newwidth=ceil($ims[0]/2);//half the width of original file - use ceil() to avoid decimals.

        $newheight=ceil($ims[1]/2);//half the height

    

        $img = imagecreatetruecolor($newwidth,$newheight); //low res img - always use truecolor to prevent any 'wierd' colour effects.

        $org_img = imagecreatefromjpeg($dest_hires); //load in hi res

    

        imagecopyresized($img, $org_img, 0, 0, 0, 0, $newwidth, $newheight, $ims[0], $ims[1]);

        imagejpeg($img,$dest_lowres,80);//save to file low res img.

        imagedestroy($img);

        

        /******creating thumbnail******/

        //see which is bigger, x or y axis, then resize smaller side to 70.

        //$resizewidth is the temporary width of the thumbnail, it is in fact the width when it has been resized

        //using the apect ration and before cropping, at this stage the thumb will not be 70px X 70px

        //unless it is a square. Same applies to height ($resizeheight).

        //$thumbx and $thumby are the positions of the cropping are for thumbnail, these are calculated

        //so that the cropped image is centered.

        

        if ($ims[0]>$ims[1])

        {//then the width is bigger

            $aspectRatio = $ims[1]/70;

    

            $resizewidth=ceil($ims[0]/$aspectRatio);

            $resizeheight=70;

            

            $thumbx=ceil(($resizewidth - $thumbwidth)/2);

            $thumby=0;

        }

        else if ($ims[0]<$ims[1])

        {//then the height is bigger

            $aspectRatio = $ims[0]/70;

    

            $resizewidth=70;

            $resizeheight=ceil($ims[1]/$aspectRatio);

            

            $thumbx=0;

            $thumby=ceil(($resizeheight - $thumbheight)/2);

        }

        else if ($ims[0]==$ims[1])

        {//then we have a perfect square.

            $resizewidth=70;

            $resizeheight=70;

            $thumbx=0;

            $thumby=0;

        }

        

        $img = imagecreatetruecolor($resizewidth,$resizeheight);

        $org_img = imagecreatefromjpeg($dest_lowres);

    

        //this is the almost thumbnail sized image with everything resized to ratio

        imagecopyresampled($img, $org_img, 0, 0, 0, 0, $resizewidth, $resizeheight, $newwidth, $newheight);

        $img2 = imagecreatetruecolor($thumbwidth,$thumbheight);



        //this is the thumbnail image, where the above is cropped.

        imagecopyresized($img2, $img, 0, 0, $thumbx, $thumby, $resizewidth, $resizeheight, $resizewidth, $resizeheight);

        imagejpeg($img2,$dest_thumbnail,100);

        imagedestroy($img);

        imagedestroy($img2);

john at mtslink dot com
04-Jan-2007 08:07


Just wanted to mention that the create_thumbnail script below fails on uppercase filenames. Many cameras default to IMG_XX.JPG and since strpos is case sensitive it fails.



I changed all the strpos to stripos and it worked wonderfully.

webmaster at jongliertreff dot de
25-Aug-2006 04:56


Here's another on-the-fly thumbnail creation script.


When I scripted the pictuerviewer on my page, I had all the pictures only in full size and qualit, because I wanted the posibility für visitors to download the pictures.


But as Imagesizes of more than 4 MP are to large for websites, I created thumbnails and the smaller pictures on the fly. But I found out, that the Script needed too much RAM, especially in the thumbnail overview, when I had more then 50 thumbnails to create on the fly at the same time.





So I modified my image creator and my viewer to let them store images, that are created. So only the first visitor has to wait (which is usually me for controlling the uploads und updates), all other visitors get the stored images, which is much faster.





Create different folders. I have a main folder called 'imagesdb' and the tree subfolders full (Full quality images), show (images for the picture viewer) and thumb (for thumbnails in overview).





Store the script for example as image.php and link it like that:





<?PHP


$image_name = "foo.jpg";


$style = "show";


     // I've taken the foldernames. It's easier. For the 


     //thumbnails replace "show" with "thumb".


$image_name = "imagesdb/$style/$image_name";


if(!file_exists($image_name))


        $image_name = "image.php?image_name=$image_name&style=$style";


     // only if file doesn't exist call the on-the-fly creating file


?>





Now the main script, stored in the file image.php:





<?PHP





$image_name = $_GET['image_name'];


$style = $_GET['style'];





     // Now set the maximum sizes to the different styles.


     // You may set additional styles, but remember to


     // create the according subfolders.





switch($style) {


  case "show":


    $max_size = 800;


    break;


  case "thumb":


    $max_size = 125;


}





$dest_file = "imagesdb/$style/$image_name";


     // set output file


$image_file = "imagesdb/full/$image_name";


     // set source file


$size = getimagesize($image_file);


     // get original size





if($size[0] > $size[1]) {


  $divisor = $size[0] / $max_size;


}


else {


  $divisor = $size[1] / $max_size;


}


     // to get allways pictures of the same size, which ist


     // mostly wanted in imageviewers, look what ist larger:


     // width or height





$new_width = $size[0] / $divisor;


$new_height = $size[1] / $divisor;


     // set new sizes





settype($new_width, 'integer');


settype($new_height, 'integer');


     // sizes should be integers





$image_big = imagecreatefromjpeg($image_file);


     // load original image


$image_small = imagecreatetruecolor($new_width, $new_height);


     // create new image


imagecopyresampled($image_small, $image_big, 0,0, 0,0, $new_width,$new_height, $size[0],$size[1]);


     // imageresampled whill result in a much higher quality


     // than imageresized


imagedestroy($image_big);


     // the original data are no longer used





header("Content-type: image/jpeg");





if($style=="show" || $style=="thumb") {


  if(!file_exists($dest_file))


    imagejpeg($image_small, $dest_file, 100);


}


     // if you have set additional sizese put them in the


     // if-arguments, too.


     // if someone calls the image.php directly in the


     // browser with imagenames allready existing, they


     // won't be overwritten





imagejpeg($image_small, '', 100);


imagedestroy($image_small);


     // finally send image to browser and destroy no longer


     // needed data.





?>





As this website helped me for several times in the past and for creating this script, I hope I can help others with this script saving the time for developing a much more performant solution than an allways-on-the-fly-creating script.

chris dot calo at gmail dot com
24-Jul-2006 07:30


Thanks to Stuart and Darren for the corrections to the create_thumbnail function.  Another note on that function: imagecreatefromwbmp was incorrectly used.  WBMPs are wireless bitmaps, not windows bitmaps (thanks to clambert at whitecrown), so the thumbnail routine as is will not be able to handle windows bitmaps.  See the notes at http://us2.php.net/manual/en/function.imagecreatefromwbmp.php for tips on working with windows bitmaps.

stuart at purpletoucan dot com
23-Jul-2006 10:55


Thanks to Chris dot Calo for the thumbnail snippet.  The file type issue is easily resolved by getting the type from the file with getimagesize, and you can handle unsupported types at that stage too.  Thus:



   list($img_width,$img_height, $type) = getimagesize($source_file); // Get the original dimentions

   if ($type != 1 && $type != 2 && $type != 3 && $type != 15) { die("Your file is not a supported format"); }



...and then later check the type again to open the image correctly:



   if ( $type == 1 ) { $img_source = imagecreatefromgif($source_file); }

   else if ( $type == 2 ) { $img_source = imagecreatefromjpeg($source_file); }

   else if ( $type == 3 ) { $img_source = imagecreatefrompng($source_file); }

   else if ( $type == 15 ) { $img_source = imagecreatefromwbmp($source_file); }

Darren Kulp ( kulp at thekulp dot com )
18-Jul-2006 08:47


With regard to chris.calo's code:



// The following block retrieves the source file.  It assumes the filename extensions match the file's format.

   if ( strpos($source_file,".gif") ) { $img_source = imagecreatefromgif($source_file); }

   if ( (strpos($source_file,".jpg")) || (strpos($source_file,".jpeg")) )

 ... etc.



It assumes more than that, namely that the filename does not contain the strings '.gif', '.jpg', '.jpeg', '.bmp', or '.png' *anywhere* in the string. Some valid files with special filenames could break this; for example, a file named "used.to.be.a.png.file.gif" would cause this script to attempt to load the file as a PNG. Obviously this is a rare case, but the issue could be easily avoided by using "else ifs" (uses less CPU time) or checking that the extension abuts the end of the string or both.



That said, the whole business could be avoided if PHP didn't clutter the namespace with different functions to do the same thing with different image formats. Ick.

chris dot calo at gmail dot com
17-Jul-2006 02:44


function create_thumbnail( $source_file, $destination_file, $max_dimension)

{

    list($img_width,$img_height) = getimagesize($source_file); // Get the original dimentions

    $aspect_ratio = $img_width / $img_height;

    

    if ( ($img_width > $max_dimension) || ($img_height > $max_dimension) ) // If either dimension is too big...

    {

        if ( $img_width > $img_height ) // For wide images...

        {

            $new_width = $max_dimension;

            $new_height = $new_width / $aspect_ratio;

        }

        elseif ( $img_width < $img_height ) // For tall images...

        {

            $new_height = $max_dimension;

            $new_width = $new_height * $aspect_ratio;

        }

        elseif ( $img_width == $img_height ) // For square images...

        {

            $new_width = $max_dimension;

            $new_height = $max_dimension;

        }

        else { echo "Error reading image size."; return FALSE; }

    }

    else { $new_width = $img_width; $new_height = $img_height; } // If it's already smaller, don't change the size.

    

    // Make sure these are integers.

    $new_width = intval($new_width);

    $new_height = intval($new_height);

    

    $thumbnail = imagecreatetruecolor($new_width,$new_height); // Creates a new image in memory.



    // The following block retrieves the source file.  It assumes the filename extensions match the file's format.

    if ( strpos($source_file,".gif") ) { $img_source = imagecreatefromgif($source_file); }

    if ( (strpos($source_file,".jpg")) || (strpos($source_file,".jpeg")) )

    { $img_source = imagecreatefromjpeg($source_file); }

    if ( strpos($source_file,".bmp") ) { $img_source = imagecreatefromwbmp($source_file); }

    if ( strpos($source_file,".png") ) { $img_source = imagecreatefrompng($source_file); }

    

    // Here we resample and create the new jpeg.

    imagecopyresampled($thumbnail, $img_source, 0, 0, 0, 0, $new_width, $new_height, $img_width, $img_height);

    imagejpeg( $thumbnail, $destination_file, 100 );

    

    // Finally, we destroy the two images in memory.

    imagedestroy($img_source);

    imagedestroy($thumbnail);

}

your [dot] sheepy [at] gmail [dot] com
03-Apr-2006 01:34


Regarding Carl Gieringer's comment, it is possible to have PHP files in utf-8.  Just make sure the editor does not output BOM, which is unnecessary in utf-8 anyway.



Except for any editors from Microsoft, most programmer's editors that supports utf allows you to surpress BOM.

doobd at doobd dot com
15-Feb-2006 09:48


in addition to my THUMBNAIL GENERATOR script:



i forgot to say, src path must not be http:// but server path (e.g. for some linux server: src=/home/users/user1/public_html/images/image1.jpg) or relative path, as in example in script (src=test.jpg, src=../test.jpg, src=pictures/test.jpg...)

15-Feb-2006 07:44


THUMBNAIL GENERATOR



Hope someone will find this usefull... save it to thumb.php and use it for on-the-fly thumbnails generating 



e.g. 

<img src= "thumb.php?src=pic.jpg&wmax=150&hmax=100&quality=90&bgcol=FF0000"> </img>



<?php

    // by dooobd@NOSPAM.doobd.com

    //

    // proportional on-the-fly thumb generator from JPG images

    //

    // usage example: 

    // <img src= "thumb.php?src=pic.jpg&wmax=150&hmax=100&quality=90&bgcol=FF0000"> </img>

    //

    // parameters:  src = source image

    //              wmax = max width

    //              hmax = max height

    //              quality = JPG quality of generated thumb - optional. 

    //                        if not specified, quality=90

    //              bgcol = if specified, allways generates exact wmax x hmax sized thumb, 

    //                      with bacground color bgcol and centered source image 

    //

    // note: if source image is smaller than desired thumbnail, it will not be resized!



    header("Content-type: image/jpeg");

    $source = imagecreatefromjpeg($src);

    $orig_w=imagesx($source);

    $orig_h=imagesy($source);

    

    if ($orig_w>$wmax || $orig_h>$hmax)

    {

        $thumb_w=$wmax;

        $thumb_h=$hmax;

        if ($thumb_w/$orig_w*$orig_h>$thumb_h) 

            $thumb_w=round($thumb_h*$orig_w/$orig_h); 

        else 

            $thumb_h=round($thumb_w*$orig_h/$orig_w);

    } else

    {

        $thumb_w=$orig_w;

        $thumb_h=$orig_h;

    }

    if (!@$bgcol)

    {

        $thumb=imagecreatetruecolor($thumb_w,$thumb_h);

        imagecopyresampled($thumb,$source,

                           0,0,0,0,$thumb_w,$thumb_h,$orig_w,$orig_h);

    }

    else

    {

        $thumb=imagecreatetruecolor($wmax,$hmax);

        imagefilledrectangle($thumb,0,0,$wmax-1,$hmax-1,intval($bgcol,16));

        imagecopyresampled($thumb,$source,

                           round(($wmax-$thumb_w)/2),round(($hmax-$thumb_h)/2),

                           0,0,$thumb_w,$thumb_h,$orig_w,$orig_h);

    }

    if (!@$quality) $quality=90;

    imagejpeg($thumb,"",$quality);

    imagedestroy($thumb);

?>

07-Feb-2006 10:21


This extension allows to save frames from movie files as jpeg.



http://ffmpeg-php.sourceforge.net

valentinp at gmail dot com
06-Jan-2006 06:41


For all those people getting the 



"Warning: imagejpeg(): Unable to access data ..."



I solved it by chmodding the directory you're writing to, to 0777. 



NO fopen() needed!



Regards,

Valentin

03-Jan-2006 05:59


Hi



I had similar problem with safe mode. My solution is:



before imagejpeg(), touch() etc.

write:

ini_set(safe_mode,Off);

and after everything:

ini_set(safe_mode,On);



strange, but it works 

Chears2All

aerowinx at hotmail dot de
22-Dec-2005 03:26


If imagejpeg brings up this warning:



Warning: imagejpeg(): Unable to access data ...



it could be a problem with "Safe Mode". A solution could be to touch the new file before, like:



touch($newfile);

imagejpeg($image_p, $newfile, 100);

Kenneth Keiter
17-Dec-2005 08:59


So.. after messing around with this beast of a function for hours, I discovered that it DOES NOT preserve the resource it is using the create the image, nor do imagepng() or imagegif(). By this I mean that you can not run two imagejpeg(), imagepng() or imagegif() calls on the same resource. Another possibly undocumented quirk... :-(

I_have at no_email_for_spam dot com
02-Nov-2005 09:01


The behaviour of not being allowed to write the file is based on a change in latest release, see http://www.php.net/ChangeLog-4.php#4.4.1



- Added missing safe_mode checks for image* functions and cURL.

- ...



Some people (including me) consider this new behaviour as broken, see also http://bugs.php.net/bug.php?id=35060 - please vote for/against the bug if you feel same/different.



Workaround is e.g. a touch($filename); before the imagejpeg($im,$filename);

moron at industrial dot org
02-Nov-2005 08:12


Please note that there is a bug report open for the currently broken safe_mode behaviour on this function:



http://bugs.php.net/?id=35060



According to the PHP staffer who has responded the docs are wrong (I don't agree but I'm also not their employee).  



The work around is to use touch() (or any other file system function that can do this) to create the file first before using imagejpeg().

mitnick at cc dot lv
02-Nov-2005 02:26


i had the same problem as tobylewis had



when i tried to call imagejpeg(), width porperly parameters given it displayed 

imagejpeg(): Unable to access usr/home/public_html/pic1.jpg



imho if not correctly configured server this function is not allowed to create the file on disk.



the workaround however is if you create the file using some other function, before call imagejpeg(). something like this



<?

$fh=fopen($file_name_dest,'w');

fclose($fh);

imagejpeg($dest,$file_name_dest, $quality);  

?>

mbailey [at] aethon [dt] co [dt] uk
18-Sep-2005 01:46


>>Bram Van Dam's



note below is missing "()" from the ob_end_clean call:



ob_end_clean; // stop this output buffer



should read



ob_end_clean(); // stop this output buffer



You can then use this for adding content-length headers (for example flash requires a content length in advance to create loaders)



e.g.



...



ob_start(); // start a new output buffer

   imagejpeg( $newimage, "", 90 );

   $ImageData = ob_get_contents();

   $ImageDataLength = ob_get_length();

ob_end_clean(); // stop this output buffer



header("Content-type: image/jpeg") ;

header("Content-Length: ".$ImageDataLength);

echo $ImageData;



...

(enVide neFelibata) envide at tugamail dot com
28-Aug-2005 07:32


Every script I was writing was giving me an error.

When writing the following code I was able, as a client, to browse the website and save the images (Save image as...) with IE. Yet with Firefox and family the browser tried to save them as 'script_name.php' instead of 'image_name.jpg'.



<?php

    header("Content-Type: image/jpeg");

    imagejpeg($image,'',100); // Output to Browser 

?>



After trying to save all the watermarked images or saving the image as 'temp.jpg' before outputing it to user, I've read this topic on BugZilla that advised to add the following header:



<?php

    header("Content-Type: image/jpeg");

    header("Content-Disposition: attachment; filename=image_name.jpg"); // THIS ONE

?>



Sorry about the English.

Bram Van Dam
19-Aug-2005 12:50


If you wish to capture the jpg data into a variable, rather than outputting it or saving it into a file (perhaps so you can put it in a database), you might want to consider output buffering. Something along these lines should work:



<?php

ob_start(); // start a new output buffer

    imagejpeg( $newimage, NULL, 100 );

    $ImageData = ob_get_contents();

ob_end_clean; // stop this output buffer

?>

John Luetke <johnl1479 gmail com>
05-Aug-2005 05:53


Rewrote the manual example into this function for creating a thumbnail image:



function thumbnail_jpeg ($original, $thumbnail, $width, $height, $quality) {

  list($width_orig, $height_orig) = getimagesize($original);

  if ($width && ($width_orig < $height_orig)) {

    $width = ($height / $height_orig) * $width_orig;

  }

        else {

    $height = ($width / $width_orig) * $height_orig;

  }

  $image_p = imagecreatetruecolor($width, $height);

  $image = imagecreatefromjpeg($originial);

  imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);

  imagejpeg($image_p, $thumbnail, $quality);

  return;

}

tobylewis at mac dot com
24-Jun-2005 07:04


After trying to get imagejpeg (and imagegif and imagepng) to save an image to a file for some time, it finally dawned on me that perhaps the function would not automatically create the file named in the second parameter.



I then used fopen to create a file prior to the call to imagejpeg and the image was successfully written to the file.  It did not seem to matter if fclose was called before or after the call to imagejpeg.



I also tried to create a file outside of php and use it as the target for output, but this initially failled because of permissions.  Once I set all write permissions on this also accepted output from imagejpeg.

ghokanso at cs dot ndsu dot edu
08-Jun-2005 09:54


When displaying an image using imagepng or imagejpeg, you may want/need to call "header("Content-type: image/jpeg")" before the imagepng and imagejpeg functions.

It appears that some servers/browers are striping out the default header so the image is not rendered and appears as raw data.

(Firefox 1.02+ and OSX Safari for example)

wojteksw at go2 dot pl
03-Apr-2005 03:37


I have changed one line in the script of Kokesh

25-Jun-2004 06:42 listed above, and now it generates better quality thumbnails. 

You have to change function imagecopyresized() to imagecopyresampled()

nerdgirl at HATE_SPAMnerdgirl dot dk
27-Feb-2005 12:31


Here is an example of uploading an image, changing its size (width/height) and saving it to a new file. It uses ftp to upload both the original and the resized image. This is usefull in situations where ftp is your only option.



It took me a while to figure it out, so I hope this will save someone else a lot of time :-)



The following assumes that the image is uploaded from a form with a filefield called 'gfx'. I have left out all error checking to keep it simple, so remember to modify the code, to suit your needs.



<?php

$new_width = 100;

$new_height = 200;

$tmp_image=imagecreatefromjpeg($_FILES['gfx']['tmp_name']);

$width = imagesx($tmp_image);

$height = imagesy($tmp_image);

$new_image = imagecreatetruecolor($new_width,$new_height);

ImageCopyResized($new_image, $tmp_image,0,0,0,0, $new_width, $new_height, $width, $height);

//Grab new image

ob_start();

ImageJPEG($new_image);

$image_buffer = ob_get_contents();

ob_end_clean();

ImageDestroy($new_image);

//Create temporary file and write to it

$fp = tmpfile();

fwrite($fp, $image_buffer)) {

rewind($fp);

//Upload new image

$conn_id = ftp_connect('ftp.example.tld');

ftp_login($conn_id,'user','pass');

ftp_fput($conn_id,'path/to/new/file.jpg', $fp, FTP_BINARY);

fclose($fp);

?>

r dot duclos at chello dot fr
11-Feb-2005 06:41


Hy, here is a little code for generate a thumbnail, very good quality. Enjoy it !



<?php



function miniature($pict, $dest_pict){

    

    $handle = @imagecreatefromjpeg($pict);



    $x=imagesx($handle);

    $y=imagesy($handle);

                                                   

        if($x > $y){                                

                $max = $x;                           

                $min = $y;                           

        }                                          

        if($x <= $y){                                

                $max = $y;                           

                $min = $x;                           

        }                                         



//$size_in_pixel : Size max of the label in pixel.  The size of the picture being 

//proportional to the original, this value define maximum size 

//of largest side with dimensions of the picture. Sorry for my english !



//Here $size_in_pixel = 100 for a thumbnail.

        $size_in_pixel = '100';



        $rate = $max/$size_in_pixel;

        $final_x = $x/$rate;

        $final_y = $y/$rate;



        if($final_x > $x) {

                $final_x = $x;

                $final_y = $y;

        }



        $final_x = ceil($final_x);

        $final_y = ceil($final_y);



        $black_picture = imageCreatetruecolor($final_x,$final_y);

        imagefill($black_picture,0,0,imagecolorallocate($black_picture, 255, 255, 255));

        imagecopyresampled($black_picture, $handle, 0, 0, 0, 0,$final_x, $final_y, $x, $y);



        if(!@imagejpeg($black_picture,$dest_pict.'/mini_'.$pict, $size_in_pixel))

        imagestring($black_picture, 1, $final_x-4,