ConFoo 2025

imagefilter

(PHP 5, PHP 7, PHP 8)

imagefilter画像にフィルタを適用する

説明

imagefilter(GdImage $image, int $filter, array|int|float|bool ...$args): bool

imagefilter() は、指定したフィルタ filterimage に適用します。

パラメータ

image

imagecreatetruecolor()のような画像作成関数が返す GdImage オブジェクト。

filter

filter は、以下のいずれかです。

  • IMG_FILTER_NEGATE: 画像の色を反転させます。
  • IMG_FILTER_GRAYSCALE: REC.601 luma (Y') の計算と同じ係数を使い、 重み付けを赤、緑、青のコンポーネントごとに変えることで、 画像を白黒にします。アルファ値は保持されます。 パレットの制限のため、パレット画像の結果は異なるかもしれません。
  • IMG_FILTER_BRIGHTNESS: 画像の輝度を変更します。 輝度レベルを args で設定します。輝度の範囲は -255 から 255 までです。
  • IMG_FILTER_CONTRAST: 画像のコントラストを 変更します。コントラストのレベルを args で設定します。
  • IMG_FILTER_COLORIZE: IMG_FILTER_GRAYSCALE と似ていますが、 色を指定することが可能です。 argsarg2 および arg3 を使用して redgreenblue の値を指定します。また arg4 を使用して alpha チャネルの値を指定します。 各値の範囲は 0 から 255 までです。
  • IMG_FILTER_EDGEDETECT: エッジを検出し、 画像のエッジを強調します。
  • IMG_FILTER_EMBOSS: 画像にエンボス処理を行います。
  • IMG_FILTER_GAUSSIAN_BLUR: ガウス分布を 使用して画像をぼかします。
  • IMG_FILTER_SELECTIVE_BLUR: 画像をぼかします。
  • IMG_FILTER_MEAN_REMOVAL: 平均を除去し、 「スケッチ風の」効果を得ます。
  • IMG_FILTER_SMOOTH: 画像を滑らかにします。 滑らかさのレベルを args で指定します。
  • IMG_FILTER_PIXELATE: モザイク効果を画像に適用します。 args でブロックの大きさを、 そして arg2 でモザイク効果のモードを指定します。
  • IMG_FILTER_SCATTER: Scatter 効果を 画像に適用します。argsarg2 を効果の強さを定義するのに使い、 選んだピクセルの色にだけ適用するために 追加で arg3 を使います。

args

arg2

arg3

arg4

  • IMG_FILTER_COLORIZE: アルファチャネル。 0 から 127 までの値で、0 は完全な不透明、127 は完全な透明を表す。

戻り値

成功した場合に true を、失敗した場合に false を返します。

エラー / 例外

IMG_FILTER_SCATTER filtersub または plus がオーバーフローやアンダーフローを引き起こす場合、 ValueError をスローします。

変更履歴

バージョン 説明
8.4.0 IMG_FILTER_SCATTER filtersub または plus がオーバーフローやアンダーフローを引き起こす場合、 ValueError をスローするようになりました。
8.0.0 image は、 GdImage クラスのインスタンスを期待するようになりました。 これより前のバージョンでは、有効な gd resource が期待されていました。
7.4.0 Scatter 効果のサポート (IMG_FILTER_SCATTER) が追加されました。

例1 imagefilter() グレースケールの例

<?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);
?>

例2 imagefilter() 輝度の例

<?php
$im
= imagecreatefrompng('sean.png');

if(
$im && imagefilter($im, IMG_FILTER_BRIGHTNESS, 20))
{
echo
'Image brightness changed.';

imagepng($im, 'sean.png');
imagedestroy($im);
}
else
{
echo
'Image brightness change failed.';
}
?>

例3 imagefilter() 単色化の例

<?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($im, 'philip.png');
imagedestroy($im);
}
else
{
echo
'Green shading failed.';
}
?>

例4 imagefilter() での打ち消しの例

<?php
// Define our negate function so its portable for
// php versions without imagefilter()
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
'Image successfully converted to negative colors.';

imagejpeg($im, 'kalle.jpg', 100);
imagedestroy($im);
}
else
{
echo
'Converting to negative colors failed.';
}
?>

例5 imagefilter() でのモザイク処理の例

<?php
// Load the PHP logo, we need to create two instances
// to show the differences
$logo1 = imagecreatefrompng('./php.png');
$logo2 = imagecreatefrompng('./php.png');

// Create the image instance we want to show the
// differences on
$output = imagecreatetruecolor(imagesx($logo1) * 2, imagesy($logo1));

// Apply pixelation to each instance, with a block
// size of 3
imagefilter($logo1, IMG_FILTER_PIXELATE, 3);
imagefilter($logo2, IMG_FILTER_PIXELATE, 3, true);

// Merge the differences onto the output image
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);

// Output the differences
header('Content-Type: image/png');
imagepng($output);
imagedestroy($output);
?>

上の例の出力は、 たとえば以下のようになります。

出力例 : imagefilter() でのモザイク処理

例6 imagefilter() でのScatter効果の例

<?php
// Load the image
$logo = imagecreatefrompng('./php.png');

// Apply a very soft scatter effect to the image
imagefilter($logo, IMG_FILTER_SCATTER, 3, 5);

// Output the image with the scatter effect
header('Content-Type: image/png');
imagepng($logo);
imagedestroy($logo);
?>

上の例の出力は、 たとえば以下のようになります。

出力例 : imagefilter() scatter

注意

注意: IMG_FILTER_SCATTER の適用結果は常にランダムです。

参考

  • imageconvolution() - div および offset の係数を使用し、3x3 の畳み込み配列を適用する
add a note

User Contributed Notes 24 notes

up
33
PanuWorld
17 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.
up
15
martijn at martijnfrazer dot nl
10 years ago
I needed an especially strong blur effect today and had a hard time achieving adequate results with the built-in IMG_FILTER_GAUSSIAN_BLUR filter. In order to achieve the strength of the blur I required I had to repeat the filter up to 100 times, which took way too long to be acceptable.

After a bit of searching, I found this answer to be quite a good solution to this problem: http://stackoverflow.com/a/20264482

Based on that technique, I wrote the following generic function to achieve a very strong blur in a reasonable amount of processing:

<?php

/**
* Strong Blur
*
* @param resource $gdImageResource
* @param int $blurFactor optional
* This is the strength of the blur
* 0 = no blur, 3 = default, anything over 5 is extremely blurred
* @return GD image resource
* @author Martijn Frazer, idea based on http://stackoverflow.com/a/20264482
*/
function blur($gdImageResource, $blurFactor = 3)
{
// blurFactor has to be an integer
$blurFactor = round($blurFactor);

$originalWidth = imagesx($gdImageResource);
$originalHeight = imagesy($gdImageResource);

$smallestWidth = ceil($originalWidth * pow(0.5, $blurFactor));
$smallestHeight = ceil($originalHeight * pow(0.5, $blurFactor));

// for the first run, the previous image is the original input
$prevImage = $gdImageResource;
$prevWidth = $originalWidth;
$prevHeight = $originalHeight;

// scale way down and gradually scale back up, blurring all the way
for($i = 0; $i < $blurFactor; $i += 1)
{
// determine dimensions of next image
$nextWidth = $smallestWidth * pow(2, $i);
$nextHeight = $smallestHeight * pow(2, $i);

// resize previous image to next size
$nextImage = imagecreatetruecolor($nextWidth, $nextHeight);
imagecopyresized($nextImage, $prevImage, 0, 0, 0, 0,
$nextWidth, $nextHeight, $prevWidth, $prevHeight);

// apply blur filter
imagefilter($nextImage, IMG_FILTER_GAUSSIAN_BLUR);

// now the new image becomes the previous image for the next step
$prevImage = $nextImage;
$prevWidth = $nextWidth;
$prevHeight = $nextHeight;
}

// scale back to original size and blur one more time
imagecopyresized($gdImageResource, $nextImage,
0, 0, 0, 0, $originalWidth, $originalHeight, $nextWidth, $nextHeight);
imagefilter($gdImageResource, IMG_FILTER_GAUSSIAN_BLUR);

// clean up
imagedestroy($prevImage);

// return result
return $gdImageResource;
}
?>
up
11
yoann at yoone dot eu
11 years ago
Here is an alternative to IMG_FILTER_COLORIZE filter, but taking the alpha parameter of each pixel in account.

<?php
function rgba_colorize($img, $color)
{
imagesavealpha($img, true);
imagealphablending($img, true);

$img_x = imagesx($img);
$img_y = imagesy($img);
for (
$x = 0; $x < $img_x; ++$x)
{
for (
$y = 0; $y < $img_y; ++$y)
{
$rgba = imagecolorsforindex($img, imagecolorat($img, $x, $y));
$color_alpha = imagecolorallocatealpha($img, $color[0], $color[1], $color[2], $rgba['alpha']);
imagesetpixel($img, $x, $y, $color_alpha);
imagecolordeallocate($img, $color_alpha);
}
}
}
?>
up
7
aiden dot mail at freemail dot hu
16 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 );
?>
up
4
ssttoo at gmail dot com
17 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.
up
4
cookie at backbone dot sk
12 years 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.';
}
?>
up
1
kees at tweakers dot net
20 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.
up
0
Manolo at msalsas dot com
10 years ago
filtertype is an integer. So if you want to use it as a variable and need to use, e.g. preg_match function you can do it in this way:

<?php
$filter
= IMG_FILTER_BRIGHTNESS;
if(
preg_match( '/^[0-9]{1,2}$/', $filter ) )
{
//Do something
}
?>

The order of the filtertypes in this manual determines the number of each filter, from 0 to 11. E.g. IMG_FILTER_NEGATE=0.
up
0
martijn(97+1) at gmail dot com (solve math)
12 years 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);
}
}
?>
up
1
fananf at nerdshack dot com
17 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.
up
0
hadrien dot jouet at grownseed dot net
13 years 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]);
}
?>
up
0
bushmakin stas (bushstas at mail dot ru)
13 years ago
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);
?>
up
1
vdepizzol at hotmail dot com
20 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);
?>
up
0
michaeln no at spam associationsplus ca
17 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.
up
0
webmaster at designsbykosi dot info
17 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.
up
0
nancy at hypertextdigital dot com
18 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.
up
0
webmaster at qudi dot de
18 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);
}
up
-1
mail at kavisiegel dot com
15 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);
?>
up
-1
a php user at nowhere dot com
18 years ago
http://www.hudzilla.org/phpbook/read.php/11_2_15
for more detailed info, and some <i>arg</i> guidelines.
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-1
shahilahmed4242 at gmail dot com
8 years ago
PHP Sepia Effect

$myImage = imagecreatefromjpeg($f);
imagefilter($myImage,IMG_FILTER_GRAYSCALE);
imagefilter($myImage,IMG_FILTER_BRIGHTNESS,-30);
imagefilter($myImage,IMG_FILTER_COLORIZE, 90, 55, 30);
header("Content-type: image/jpeg");
imagejpeg($myImage );
imagejpeg($myImage,$f);
imagedestroy( $myImage );
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-2
santibari at fibertel dot com
18 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
?>
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-1
Padde
12 years 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.
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-2
jonathan dot gotti at gmail dot com
14 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
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-3
mail at pedrocandeias dot com
13 years 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);

?>
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