imagefilltoborder
a function to make all colors gray except the only one
i made it myself so the code is note so beautiful )
<?php
function imagecolorfilter($im){
$height = imagesy($im);
$width = imagesx($im);
for($x=0; $x<$width; $x++){
for($y=0; $y<$height; $y++){
$rgb = ImageColorAt($im, $x, $y);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
$c=($r+$g+$b)/3;
//if($g<$r || $g<$b+20){$r=$c;$g=$c; $b=$c;}//leaves only green
//if($b<$r || $b<$g){$r=$c;$g=$c; $b=$c;}//only blue
if($r<$g+30 || $r<$b){$r=$c;$g=$c; $b=$c;}//only red
//if($r<$g-1 || $r>$g+60 || $b>$g-50){$r=$c;$g=$c; $b=$c;}//only yellow
imagesetpixel($im, $x, $y,imagecolorallocate($im, $r,$g,$b));
}
}
}
header ("Content-type: image/jpeg");
$im = imagecreatefromjpeg("image.jpg");
imagecolorfilter($im);
imagejpeg($im);
?>
imagefilter
(PHP 5)
imagefilter — Bir resme bir süzgeç uygular
Açıklama
bool imagefilter
( resource
$resim
, int $süzgeç
[, int $d1
[, int $d2
[, int $d3
[, int $d4
]]]] )
imagefilter() işlevi, türü süzgeç
ile belirtilen süzgeci resim resmine uygular.
Değiştirgeler
-
resim -
imagecreatetruecolor() gibi bir resim oluşturma işlevinden dönen bir resim verisi.
-
süzgeç -
süzgeçşunlardan biri olabilir:-
IMG_FILTER_NEGATE: Resimdeki tüm renkleri zıt renge dönüştürür. -
IMG_FILTER_GRAYSCALE: Resmi gri tonlamalı hale getirir. -
IMG_FILTER_BRIGHTNESS: Resmin parlaklığın değiştirir. Parlaklık seviyesini belirtmek içind1değiştirgesini kullanın. -
IMG_FILTER_CONTRAST: Resmin karşıtlık seviyesini değiştirir. Karşıtlık seviyesini belirtmek içind1değiştirgesini kullanın. -
IMG_FILTER_COLORIZE: Rengi sizin belirtmeniz dışındaIMG_FILTER_GRAYSCALEgibidir. Kırmızı, yeşil ve mavi renk seviyeleri belirtmek için sıraylad1,d2ved3değiştirgelerini, alfa kanalı için ded4değiştirgesini kullanın. Ana renklerin seviyesi 0 ile 255 arasında belirtilebilir. -
IMG_FILTER_EDGEDETECT: Resmin kenarlarını vurgulamak için kenar algılaması kullanılır. -
IMG_FILTER_EMBOSS: Resme kabartma uygular. -
IMG_FILTER_GAUSSIAN_BLUR: Resmi Gauss yöntemiyle bulanıklaştırır. -
IMG_FILTER_SELECTIVE_BLUR: Resmi bulanıklaştırır. -
IMG_FILTER_MEAN_REMOVAL: Karalama taslak etkisi oluşturmak için silme işlemi uygular. -
IMG_FILTER_SMOOTH: Resmin sert hatlarını yumuşatır. Yumuşatma seviyesini belirtmek içind1değiştirgesini kullanın. -
IMG_FILTER_PIXELATE: Resme mozaik etkisi verir. Mozaik boyutu içind1mozaik etki kipini belirtmek içind2değiştirgesini kullanın.
-
-
d1 -
-
IMG_FILTER_BRIGHTNESS: Parlaklık seviyesi. -
IMG_FILTER_CONTRAST: Karşıtlık seviyesi. -
IMG_FILTER_COLORIZE: Kırmızı bileşenin seviyesi. -
IMG_FILTER_SMOOTH: Yumuşatma seviyesi. -
IMG_FILTER_PIXELATE: Piksel cinsinden mozaik boyu.
-
-
d2 -
-
IMG_FILTER_COLORIZE: Yeşil bileşenin seviyesi. -
IMG_FILTER_PIXELATE: Gelişkin mozaik etkisinin kullanılıp kullanılmayacağı (FALSEöntanımlıdır).
-
-
d3 -
-
IMG_FILTER_COLORIZE: Mavi bileşenin seviyesi.
-
-
d4 -
-
IMG_FILTER_COLORIZE: Alfa kanalı. 0-127 arasında belirtilebilir. 0 tamamen mat, 127 ise tamamen şeffaf demektir.
-
Dönen Değerler
Başarı durumunda TRUE, başarısızlık durumunda FALSE döner.
Sürüm Bilgisi
| Sürüm: | Açıklama |
|---|---|
| 5.3.0 |
Mozaik desteği (IMG_FILTER_PIXELATE) eklendi.
|
| 5.2.5 |
IMG_FILTER_COLORIZE için alfa kanalı desteği eklendi.
|
Örnekler
Örnek 1 - imagefilter() gri tonlama örneği
<?php
$im = imagecreatefrompng('dave.png');
if($im && imagefilter($im, IMG_FILTER_GRAYSCALE))
{
echo 'Resme gri tonlama uygulandı.';
imagepng($im, 'dave.png');
}
else
{
echo 'Resme gri tonlama uygulanamadı.';
}
imagedestroy($im);
?>
Örnek 2 - imagefilter() parlaklık örneği
<?php
$im = imagecreatefrompng('sean.png');
if($im && imagefilter($im, IMG_FILTER_BRIGHTNESS, 20))
{
echo 'Resmin parlaklığı değişti.';
imagepng($im, 'sean.png');
imagedestroy($im);
}
else
{
echo 'Resmin parlaklığı değiştirilemedi.';
}
?>
Örnek 3 - imagefilter() renklendirme örneği
<?php
$im = imagecreatefrompng('philip.png');
/* K, Y, M olarak 0, 255, 0 yeşildir */
if($im && imagefilter($im, IMG_FILTER_COLORIZE, 0, 255, 0))
{
echo 'Resim yeşertildi.';
imagepng($im, 'philip.png');
imagedestroy($im);
}
else
{
echo 'Resim yeşertilemedi.';
}
?>
Örnek 4 imagefilter() negatiflik örneği
<?php
// İşlevin taşınabilir olması için, yani imagefilter() kullanamadığımız
// durumlar için kendi negatiflik işlevimizi yazalım
function negate($im)
{
if(function_exists('imagefilter'))
{
return imagefilter($im, IMG_FILTER_NEGATE);
}
for($x = 0; $x < imagesx($im); ++$x)
{
for($y = 0; $y < imagesy($im); ++$y)
{
$index = imagecolorat($im, $x, $y);
$rgb = imagecolorsforindex($index);
$color = imagecolorallocate($im, 255 - $rgb['red'],
255 - $rgb['green'], 255 - $rgb['blue']);
imagesetpixel($im, $x, $y, $color);
}
}
return(true);
}
$im = imagecreatefromjpeg('kalle.jpg');
if($im && negate($im))
{
echo 'Resmin negatifi başarıyla elde edildi.';
imagejpeg($im, 'kalle.jpg', 100);
imagedestroy($im);
}
else
{
echo 'Resmin negatifi elde edilemedi.';
}
?>
Örnek 5 imagefilter() mozaikleştirme örneği
<?php
// PHP logosunu yükleyelim, farkları göstermek için bize iki resim lazım
$logo1 = imagecreatefrompng('./php.png');
$logo2 = imagecreatefrompng('./php.png');
// Üzerinde farkları göstermek için bir tuval oluşturalım
$output = imagecreatetruecolor(imagesx($logo1) * 2, imagesy($logo1));
// Her örneğe 3 piksellik mozaikleştirme uygulayalım
imagefilter($logo1, IMG_FILTER_PIXELATE, 3);
imagefilter($logo2, IMG_FILTER_PIXELATE, 3, true);
// Farkları çıktı resminde karıştıralım
imagecopy($output, $logo1, 0, 0, 0, 0, imagesx($logo1) - 1,
imagesy($logo1) - 1);
imagecopy($output, $logo2, imagesx($logo2), 0, 0, 0,
imagesx($logo2) - 1, imagesy($logo2) - 1);
imagedestroy($logo1);
imagedestroy($logo2);
// Farkları çıktılayalım
header('Content-Type: image/png');
imagepng($output);
imagedestroy($output);
?>
Yukarıdaki örnek şuna benzer bir çıktı üretir:
Notlar
Bilginize: Bu işlev sadece, PHP, PHP paketinde bulunan GD kütüphanesi ile derlenmişse kullanılabilir.
add a note
User Contributed Notes
imagefilter - [23 notes]
bushmakin stas (bushstas at mail dot ru) ¶
2 years ago
jonathan dot gotti at gmail dot com ¶
2 years ago
IMG_FILTER_COLORIZE doesn't seem to work on palette image, here's a way to achieve same result with palette image:
<?php
//$color is an array containing rvb infos (ie: array(255,80,0))
function paletteColorize($imgResource,array $color){
$nbColors = imagecolorstotal($imgResource);
for($i=0; $i<$nbColors; $i++){
$c = array_values(imagecolorsforindex($imgRes,$i));
for($y=0;$y<3;$y++)
$c[$y] = max(0,min(255,$c[$y]+$color[$y]));
imagecolorset($imgResource,$i,$c[0],$c[1],$c[2]);
}
}
?>
Here's also a function that work on both truecolor and palette images that try to do something similar to greyscale with a given color
<?php
function colorScale($imgRes,array $color){
imagefilter($imgRes,IMG_FILTER_GRAYSCALE);
$color = self::_read_color($color);
$luminance=($color[0]+$color[1]+$color[2])/3; // average luminance added by the color
$brightnessCorrection = $luminance/3; // quantity of brightness to correct for each channel
if( $luminance < 127 ){
$brightnessCorrection -= 127/3; // color is dark so we have to negate the brightness correction
}
if(! imageistruecolor($imgRes) ){
$nbColors = imagecolorstotal($imgRes);
for($i=0; $i<$nbColors; $i++){
$c = array_values(imgagecolorsforindex($imgRes,$i));
for($y=0;$y<3;$y++){
$c[$y] = max(0, min(255, $c[$y] + ($color[$y]-$luminance) + $brightnessCorrection) ); // parentheses just for better comprehension
}
imagecolorset($omgRes,$i,$c[0],$c[1],$c[2]);
}
}else{ // much easier with truecolor
imagefilter($imgRes, IMG_FILTER_COLORIZE, $color[0]-$luminance, $color[1]-$luminance, $color[2]-$luminance);
imagefilter($imgRes, IMG_FILTER_BRIGHTNESS, $brightnessCorrection);
}
}
?>
with hope that someone will find this useful
aiden dot mail at freemail dot hu ¶
5 years ago
Function to change the transparency of a png image on the fly. Works only with PNG, and with a browser supporting alpha channel.
The function stretches the opacity-range of the image, so that the most opaque pixel(s) will be set to the given opacity. (Other opacity values in pixels are modified accordingly.)
Returns success or failure.
<?php
function filter_opacity( &$img, $opacity ) //params: image resource id, opacity in percentage (eg. 80)
{
if( !isset( $opacity ) )
{ return false; }
$opacity /= 100;
//get image width and height
$w = imagesx( $img );
$h = imagesy( $img );
//turn alpha blending off
imagealphablending( $img, false );
//find the most opaque pixel in the image (the one with the smallest alpha value)
$minalpha = 127;
for( $x = 0; $x < $w; $x++ )
for( $y = 0; $y < $h; $y++ )
{
$alpha = ( imagecolorat( $img, $x, $y ) >> 24 ) & 0xFF;
if( $alpha < $minalpha )
{ $minalpha = $alpha; }
}
//loop through image pixels and modify alpha for each
for( $x = 0; $x < $w; $x++ )
{
for( $y = 0; $y < $h; $y++ )
{
//get current alpha value (represents the TANSPARENCY!)
$colorxy = imagecolorat( $img, $x, $y );
$alpha = ( $colorxy >> 24 ) & 0xFF;
//calculate new alpha
if( $minalpha !== 127 )
{ $alpha = 127 + 127 * $opacity * ( $alpha - 127 ) / ( 127 - $minalpha ); }
else
{ $alpha += 127 * $opacity; }
//get the color index with new alpha
$alphacolorxy = imagecolorallocatealpha( $img, ( $colorxy >> 16 ) & 0xFF, ( $colorxy >> 8 ) & 0xFF, $colorxy & 0xFF, $alpha );
//set pixel with the new color + opacity
if( !imagesetpixel( $img, $x, $y, $alphacolorxy ) )
{ return false; }
}
}
return true;
}
?>
Example for use:
<?php
$image = imagecreatefrompng( "img.png" );
filter_opacity( $image, 75 );
header( "content-type: image/png" );
imagepng( $image );
imagedestroy( $image );
?>
michaeln no at spam associationsplus ca ¶
5 years ago
Note: applying IMG_FILTER_EMBOSS to text and using in a customization to the CAPTCHA image script in phpBB or a project of your own is a very good way to stop OCR-ing bots from getting through. Embossed serif fonts are fairly easy for the human eye to understand but to an OCR script it is extremely difficult because it seems to give it the illusion of 3D.
If you only allocate 2 or 3 colours in the image, it uses the background colour alot in the embossed text, which greatly contributes to this.
I made my own custom CAPTCHA script to stop phpBB post spam for a client site I was developing and I have gone from getting 2-3 new spam users created every day to zero.
Anything with the source code freely available out there right now is possible to be defeated by spammers once one of them stars sharing code with the other spammers, but if you run something at least someone custom, their bots will pass you over.
PanuWorld ¶
6 years ago
The documentation misses the exact meaning and valid ranges of the arguments for ImageFilter(). According to the 5.2.0 sources the arguments are:
IMG_FILTER_BRIGHTNESS
-255 = min brightness, 0 = no change, +255 = max brightness
IMG_FILTER_CONTRAST
-100 = max contrast, 0 = no change, +100 = min contrast (note the direction!)
IMG_FILTER_COLORIZE
Adds (subtracts) specified RGB values to each pixel. The valid range for each color is -255...+255, not 0...255. The correct order is red, green, blue.
-255 = min, 0 = no change, +255 = max
This has not much to do with IMG_FILTER_GRAYSCALE.
IMG_FILTER_SMOOTH
Applies a 9-cell convolution matrix where center pixel has the weight arg1 and others weight of 1.0. The result is normalized by dividing the sum with arg1 + 8.0 (sum of the matrix).
any float is accepted, large value (in practice: 2048 or more) = no change
ImageFilter seem to return false if the argument(s) are out of range for the chosen filter.
Padde ¶
5 months ago
I played with IMG_FILTER_SMOOTH and tried some negative
values.
-1 to -7: looks like a mix of smoothness and edgedetect
-8: image seems to be completely broken
-9 and lower: kind of sharpening effect (-9 sharper than -10)
I think the sharpening effect in particular could be useful.
martijn(97+1) at gmail dot com (solve math) ¶
7 months ago
Simple pixelate function, just in case you are < 5.3
<?php
function pixelate(&$image, $pixelsize){
$maxX = imagesx($image);
$maxY = imagesy($image);
$rad=floor($pixelsize/2);
for($x=$rad;$x<$maxX;$x+=$pixelsize)
for($y=$rad;$y<$maxY;$y+=$pixelsize){
$color = imagecolorat($image, $x, $y);
imagefilledrectangle ($image, $x-$rad, $y-$rad, $x+$pixelsize-1, $y+$pixelsize-1,$color);
}
}
?>
cookie at backbone dot sk ¶
9 months ago
a function to create nice vignette effect:
<?php
function vignette($im){
global $width, $height;
$width = imagesx($im);
$height = imagesy($im);
function effect($x, $y, &$rgb){
global $width, $height;
$sharp = 0.4; // 0 - 10 small is sharpnes,
$level = 0.7; // 0 - 1 small is brighter
$l = sin(M_PI / $width * $x) * sin(M_PI / $height * $y);
$l = pow($l, $sharp);
$l = 1 - $level * (1 - $l);
$rgb['red'] *= $l;
$rgb['green'] *= $l;
$rgb['blue'] *= $l;
}
for($x = 0; $x < imagesx($im); ++$x){
for($y = 0; $y < imagesy($im); ++$y){
$index = imagecolorat($im, $x, $y);
$rgb = imagecolorsforindex($im, $index);
effect($x, $y, $rgb);
$color = imagecolorallocate($im, $rgb['red'], $rgb['green'], $rgb['blue']);
imagesetpixel($im, $x, $y, $color);
}
}
return(true);
}
$im = imagecreatefromjpeg('cars7_134.jpg');
if($im and vignette($im)){
header('Content-Type: image/jpeg');
imagejpeg($im);
imagedestroy($im);
}else{
echo 'Vignette failed.';
}
?>
mail at pedrocandeias dot com ¶
1 year ago
// With transparent PNG file you can colorize the "positive" items and stand the transparent has it is - Beta code
<?php
header('Content-Type: image/png');
$im = imagecreatefrompng('image.png');
$width = imagesx($im);
$height = imagesy($im);
$imn = imagecreatetruecolor($width, $height);
imagealphablending($imn,false);
$col=imagecolorallocatealpha($imn,255,255,255,127);
imagesavealpha($imn,true);
imagefilledrectangle($imn,0,0,$width,$height,$col);
imagealphablending($imn,true);
imagecopy($imn, $im, 0, 0, 0, 0, $width, $height);
imagefilter($imn, IMG_FILTER_NEGATE);
// FOR A TRANSPARENT PNG FILE WITH SOMETHING INSIDE, YOU CAN CHANGE THE COLOR HERE: I HAVE RGB: 0, 255, 0
imagefilter($imn, IMG_FILTER_COLORIZE, 0, 255, 0);
imagepng($imn);
imagedestroy($imn);
?>
hadrien dot jouet at grownseed dot net ¶
1 year ago
For people looking to apply a 'multiply' effect on images like the one in Photoshop (generally b&w ones), you can achieve it with the IMG_FILTER_COLORIZE filter.
<?php
function multiplyColor(&$im, $color = array(255, 0, 0))
{
//get opposite color
$opposite = array(255 - $color[0], 255 - $color[1], 255 - $color[2]);
//now we subtract the opposite color from the image
imagefilter($im, IMG_FILTER_COLORIZE, -$opposite[0], -$opposite[1], -$opposite[2]);
}
?>
mail at kavisiegel dot com ¶
3 years ago
Searching for a way to easily change the color of the image, I tried IMG_FILTER_COLORIZE. I was unable to get the quality results I wanted. It turns out PHP's Colorize is the equivalent of Photoshop's "Linear Dodge" layer filter.
Hue adjustments have always worked well for me, so I figured I could try with PHP.
This function is kind of slow on larger images, but on small images like what I'm using it for, the difference is trivial.
The script calculates the ratio or red, to green, to blue in the color provided, then scales the image appropriately... unfortunately, it does it pixel by pixel.
Here's a demo and comparison of this function, to photoshop's hue function, to PHP's colorize. http://img146.imageshack.us/img146/3167/imagefilterhuedemo.png
<?php
function imagefilterhue($im,$r,$g,$b){
$rgb = $r+$g+$b;
$col = array($r/$rgb,$b/$rgb,$g/$rgb);
$height = imagesy($im);
$width = imagesx($im);
for($x=0; $x<$width; $x++){
for($y=0; $y<$height; $y++){
$rgb = ImageColorAt($im, $x, $y);
$r = ($rgb >> 16) & 0xFF;
$g = ($rgb >> 8) & 0xFF;
$b = $rgb & 0xFF;
$newR = $r*$col[0] + $g*$col[1] + $b*$col[2];
$newG = $r*$col[2] + $g*$col[0] + $b*$col[1];
$newB = $r*$col[1] + $g*$col[2] + $b*$col[0];
imagesetpixel($im, $x, $y,imagecolorallocate($im, $newR, $newG, $newB));
}
}
}
header ("Content-type: image/jpeg");
$im = imagecreatefromjpeg("test.jpg");
// Usage: Just as imagefilter(), except with no filtertype.
// imagefilterhue(resource $image, int $red, int $green , int $blue)
imagefilterhue($im,2,70,188);
// The equivalent with colorize, as tested in demo image: imagefilter($im, IMG_FILTER_COLORIZE, 2, 70, 188);
imagejpeg($im);
?>
ssttoo at gmail dot com ¶
5 years ago
Here's a page that shows the different filters in action
http://www.phpied.com/image-fun-with-php-part-2/
Also shows some quick ways to do sepia.
admin at phpgfx dot com ¶
5 years ago
this is a sepia function using microsoft's definition
<?php
function imagesepia( $img ) {
$total = imagecolorstotal( $img );
for ( $i = 0; $i < $total; $i++ ) {
$index = imagecolorsforindex( $img, $i );
$red = ( $index["red"] * 0.393 + $index["green"] * 0.769 + $index["blue"] * 0.189 ) / 1.351;
$green = ( $index["red"] * 0.349 + $index["green"] * 0.686 + $index["blue"] * 0.168 ) / 1.203;
$blue = ( $index["red"] * 0.272 + $index["green"] * 0.534 + $index["blue"] * 0.131 ) / 2.140;
imagecolorset( $img, $i, $red, $green, $blue );
}
}
?>
webmaster at designsbykosi dot info ¶
6 years ago
This will only work if you have php5. For php4, you'll have to use the sepia function set webmaster at qudi dot de suggested.
fananf at nerdshack dot com ¶
6 years ago
If you're looking for fast sepia effect that can be used for on-the-fly thumbnails generation you can't use sophisticated functions. The faster and much better way than described by webmaster at qudi dot de in the note from 31-Jan-2006 is applying colorize filter AFTER grayscale.
<?php
(...)
imagefilter($yourimage, IMG_FILTER_GRAYSCALE); imagefilter($yourimage, IMG_FILTER_COLORIZE, 90, 60, 40);
(...)
?>
I used (90,60,40) for my sepia after couple of tests, however, if you need darker or lighter just check what suits you best.
trucex email over at gmail ¶
6 years ago
It appears that imagefilter doesn't play nice with apha. If you run an imagefilter on a transparent image it'll return a black image...similar to a lot of Photoshop plugins do.
nancy at hypertextdigital dot com ¶
6 years ago
This routine was just what I was looking for, I wanted web admin users to be able to recolour their uploaded photos (to go with a news item) either a blue tint or sepia to match the appearance of other colours used on the website.
Using a form with a select box containing the RGB values, I can give them the option of either of the two tints or no colourization at all, plus resize their images to the viewing size and a thumbnail image on the fly without having to use any other image editing software.
santibari at fibertel dot com ¶
7 years ago
A colorize algorithm wich preserves color luminosity (i.e black
will output black, and white will output white).
This works in PHP4 and is great for customizing interfaces
dinamically.
<?php
function colorize($img_src,$img_dest, $r, $g, $b)
{
if(!$im = imagecreatefromgif($img_src))
return "Could not use image $img_src";
//We will create a monochromatic palette based on
//the input color
//which will go from black to white
//Input color luminosity: this is equivalent to the
//position of the input color in the monochromatic
//palette
$lum_inp=round(255*($r+$g+$b)/765); //765=255*3
//We fill the palette entry with the input color at its
//corresponding position
$pal[$lum_inp]['r']=$r;
$pal[$lum_inp]['g']=$g;
$pal[$lum_inp]['b']=$b;
//Now we complete the palette, first we'll do it to
//the black,and then to the white.
//FROM input to black
//===================
//how many colors between black and input
$steps_to_black=$lum_inp;
//The step size for each component
if($steps_to_black)
{
$step_size_red=$r/$steps_to_black;
$step_size_green=$g/$steps_to_black;
$step_size_blue=$b/$steps_to_black;
}
for($i=$steps_to_black;$i>=0;$i--)
{
$pal[$steps_to_black-$i]['r']=$r-round($step_size_red*$i);
$pal[$steps_to_black-$i]['g']=$g-round($step_size_green*$i);
$pal[$steps_to_black-$i]['b']=$b-round($step_size_blue*$i);
}
//From input to white:
//===================
//how many colors between input and white
$steps_to_white=255-$lum_inp;
if($steps_to_white)
{
$step_size_red=(255-$r)/$steps_to_white;
$step_size_green=(255-$g)/$steps_to_white;
$step_size_blue=(255-$b)/$steps_to_white;
}
else
$step_size_red=$step_size_green=$step_size_blue=0;
//The step size for each component
for($i=($lum_inp+1);$i<=255;$i++)
{
$pal[$i]['r']=$r + round($step_size_red*($i-$lum_inp));
$pal[$i]['g']=$g + round($step_size_green*($i-$lum_inp));
$pal[$i]['b']=$b + round($step_size_blue*($i-$lum_inp));
}
//--- End of palette creation
//Now,let's change the original palette into the one we
//created
for($c = 0; $c < $palette_size; $c++)
{
$col = imagecolorsforindex($im, $c);
$lum_src=round(255*($col['red']+$col['green']
+$col['blue'])/765);
$col_out=$pal[$lum_src];
imagecolorset($im, $c, $col_out['r'],
$col_out['g'],
$col_out['b']);
}
//save the image file
imagepng($im,$img_dest);
imagedestroy($im);
}//end function colorize
?>
webmaster at qudi dot de ¶
7 years ago
for a quick, ok-looking, sepia-effect (also in php4) I just use this little fellow, since a real implementation of sepia was just way too slow.
function pseudosepia(&$im,$percent){
$sx=imagesx($im);
$sy=imagesy($im);
$filter=imagecreatetruecolor($sx,$sy);
$c=imagecolorallocate($filter,100,50,50);
imagefilledrectangle($filter,0,0,$sx,$sy,$c);
imagecopymerge($im,$filter,0,0,0,0,$sx,$sy,$percent);
}
a php user at nowhere dot com ¶
7 years ago
http://www.hudzilla.org/phpbook/read.php/11_2_15
for more detailed info, and some <i>arg</i> guidelines.
vdepizzol at hotmail dot com ¶
8 years ago
Examples using imagefilter():
<?php
$im = imagecreatefrompng('dave.png');
if ($im && imagefilter($im, IMG_FILTER_GRAYSCALE)) {
echo 'Image converted to grayscale.';
imagepng($im, 'dave.png');
} else {
echo 'Conversion to grayscale failed.';
}
imagedestroy($im);
?>
/////////////////////////////
<?php
$im = imagecreatefrompng('sean.png');
if ($im && imagefilter($im, IMG_FILTER_BRIGHTNESS, 20)) {
echo 'Image brightness changed.';
imagepng($im, 'sean.png');
} else {
echo 'Image brightness change failed.';
}
imagedestroy($im);
?>
/////////////////////////////
<?php
$im = imagecreatefrompng('philip.png');
/* R, G, B, so 0, 255, 0 is green */
if ($im && imagefilter($im, IMG_FILTER_COLORIZE, 0, 255, 0)) {
echo 'Image successfully shaded green.';
imagepng($im, 'philip.png');
} else {
echo 'Green shading failed.';
}
imagedestroy($im);
?>
kees at tweakers dot net ¶
8 years ago
From what i have been able to find from this function, it accepts the following arguments:
IMG_FILTER_NEGATE
IMG_FILTER_GRAYSCALE
IMG_FILTER_EDGEDETECT
IMG_FILTER_GAUSSIAN_BLUR
IMG_FILTER_SELECTIVE_BLUR
IMG_FILTER_EMBOSS
IMG_FILTER_MEAN_REMOVAL
The following arguments need one or more arguments.
IMG_FILTER_SMOOTH, -1924.124
IMG_FILTER_COLORIZE, -127.12, -127.98, 127
IMG_FILTER_CONTRAST, -90
IMG_FILTER_BRIGHTNESS, 98
I haven't tested them all, the names speak for themselves.
Kae Cyphet ¶
5 years ago
To solve that annoying problem of having to install a pre-compiled version of GD just to get imagefilter($image,IMAGE_FILTER_NEGATE) working.
here is an open source solution.
uses the standard stuff included in php when you uncomment 'extension=php_gd2.dll' in the php.ini file and there ya go!
Useage:
<?php
$im = imagecreatefromjpeg("my_fav_image.jpg");
header("Content-type: image/jpg");
imagejpeg(invertimage($im));
imagedestroy($im);
?>
'=================================
<?php
function int2rgb($myint)
{
return array('red' => 0xFF & ($myint >> 0x10), 'green' => 0xFF & ($myint >> 0x8), 'blue' => 0xFF & $myint);
}
function invertimage($im)
{
$wid = imagesx($im);
$hei = imagesy($im);
$im2 = imagecreatetruecolor($wid,$hei);
$i=0;
$j=0;
$rgb = array('red' => 0, 'green' => 0, 'blue' => 0);
$ref = 0;
for($i = 0;$i < $wid; $i++)
{
for($j = 0;$j < $hei; $j++)
{
$rgb = int2rgb(imagecolorat($im,$i,$j));
$ref = imagecolorallocate($im2,255 - intval($rgb['red']),255 - intval($rgb['green']),255 - intval($rgb['blue']));
imagesetpixel($im2,$i,$j,$ref);
}
}
return $im2;
}
?>