imagefilter

(PHP 5, PHP 7, PHP 8)

imagefilter — Aplica um filtro a uma imagem

Descrição

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

imagefilter() aplica o filtro informado em filter na imagem fornecida em image.

Parâmetros

image

Um objeto GdImage, retornado por uma das funções de criação de imagem, como imagecreatetruecolor().

filter

filter pode ser uma das seguintes constantes:

IMG_FILTER_NEGATE: Inverte todas as cores da imagem.
IMG_FILTER_GRAYSCALE: Converte a imagem em escala de cinza alterando os componentes vermelho, verde e azul para suas respectivas somas ponderadas, usando os mesmos coeficientes de cálculo de luminância (Y') da REC.601. Os componentes alfa são retidos. Para imagens de paleta, o resultado pode ser diferente devido a limitações da paleta.
IMG_FILTER_BRIGHTNESS: Altera o brilho da imagem. Use args para definir o nível de brilho. O intervalo de brilho é de -255 a 255.
IMG_FILTER_CONTRAST: Altera o contraste da imagem. Use args para definir o nível de contraste.
IMG_FILTER_COLORIZE: Parecida com IMG_FILTER_GRAYSCALE, exceto que pode-se especificar a cor. Use args, arg2 e arg3 na forma de red (vermelho), green (verde), blue (azul) e arg4 para o canal alpha (alfa). O intervalo de cada cor é de 0 a 255.
IMG_FILTER_EDGEDETECT: Usa detecção de borda para destacar as bordas da imagem.
IMG_FILTER_EMBOSS: Faz alto relevo da imagem.
IMG_FILTER_GAUSSIAN_BLUR: Desfoca a imagem usando o método gaussiano.
IMG_FILTER_SELECTIVE_BLUR: Desfoca a imagem.
IMG_FILTER_MEAN_REMOVAL: Usa a remoção de média para alcançar um efeito de "esboço".
IMG_FILTER_SMOOTH: Torna a imagem mais suave. Use args para definir o nível de suavidade.
IMG_FILTER_PIXELATE: Aplica efeito de pixelização à imagem, use args para definir o tamanho do bloco e arg2 para definir o modo do efeito de pixelização.
IMG_FILTER_SCATTER: Aplica efeito de dispersão à imagem, use args e arg2 para definir a intensidade do efeito e adicionalmente arg3 para aplicar o efeito somente em cores de pixels selecionadas.

args

IMG_FILTER_BRIGHTNESS: Nível de brilho.
IMG_FILTER_CONTRAST: Nível de contraste.
IMG_FILTER_COLORIZE: Valor do componente vermelho.
IMG_FILTER_SMOOTH: Nível de suavidade.
IMG_FILTER_PIXELATE: Tamanho do bloco em pixels.
IMG_FILTER_SCATTER: Nível de subtração de efeito. Não pode ser maior ou igual ao nível de adição de efeito definido com arg2.

arg2

IMG_FILTER_COLORIZE: Valor do componente verde.
IMG_FILTER_PIXELATE: Informa se deve ser usada efeito de pixelização avançada ou não (o padrão é false).
IMG_FILTER_SCATTER: Nível de adição de efeito.

arg3

IMG_FILTER_COLORIZE: Valor do componente azul.
IMG_FILTER_SCATTER: Array opcional indexado com valores de cores nas quais os efeitos serão aplicados.

arg4

IMG_FILTER_COLORIZE: Canal alfa, um valor entre 0 e 127. 0 indica completamente opaco e 127 indica completamente transparente.

Valor Retornado

Retorna true em caso de sucesso ou false em caso de falha.

Erros/Exceções

Lança um ValueError se sub ou plus puderem causar um estouro de limites com IMG_FILTER_SCATTER definido em filter.

Registro de Alterações

Versão	Descrição
8.4.0	Agora lança um ValueError se `sub` ou `plus` puderem causar um estouro de limites com `IMG_FILTER_SCATTER` definido em `filter`.
8.0.0	O parâmetro `image` agora espera uma instância de GdImage; anteriormente, um resource `gd` válido era esperado.
7.4.0	Suporte a dispersão (`IMG_FILTER_SCATTER`) foi adicionado.

Exemplos

Exemplo #1 Exemplo de escala de cinza com imagefilter()

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

if($im && imagefilter($im, IMG_FILTER_GRAYSCALE))
{
    echo 'Imagem convertida para escala de cinza.';

    imagepng($im, 'dave.png');
}
else
{
    echo 'Conversão para escala de cinza falhou.';
}

imagedestroy($im);
?>

Exemplo #2 Exemplo de brilho com imagefilter()

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

if($im && imagefilter($im, IMG_FILTER_BRIGHTNESS, 20))
{
    echo 'Brilho da imagem alterado.';

    imagepng($im, 'sean.png');
    imagedestroy($im);
}
else
{
    echo 'Alteração no brilho da imagem falhou.';
}
?>

Exemplo #3 Exemplo de colorização com imagefilter()

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

/* R, G, B, portanto 0, 255, 0 é verde */
if($im && imagefilter($im, IMG_FILTER_COLORIZE, 0, 255, 0))
{
    echo 'Imagem tonalizada em verde com sucesso.';

    imagepng($im, 'philip.png');
    imagedestroy($im);
}
else
{
    echo 'Tonalização em verde falhou.';
}
?>

Exemplo #4 Exemplo de inversão com imagefilter()

<?php
// Define a função de inversão de forma que seja portável
// para versões de php sem 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 'Imagem convertida com sucesso para cores invertidas.';

    imagejpeg($im, 'kalle.jpg', 100);
    imagedestroy($im);
}
else
{
    echo 'Conversão para cores invertidas falhou.';
}
?>

Exemplo #5 Exemplo de pixelização com imagefilter()

<?php
// Carrega a logomarca do PHP, necessáio criar duas instâncias
// para mostrar as diferenças
$logo1 = imagecreatefrompng('./php.png');
$logo2 = imagecreatefrompng('./php.png');

// Cria a instância da imagem onde as diferenças serão
// mostradas
$output = imagecreatetruecolor(imagesx($logo1) * 2, imagesy($logo1));

// Aplica a pixelização para cada instância, com um bloco
// de tamanho 3
imagefilter($logo1, IMG_FILTER_PIXELATE, 3);
imagefilter($logo2, IMG_FILTER_PIXELATE, 3, true);

// Funde as diferenças na imagem de saída
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);

// Mostra a diferença
header('Content-Type: image/png');
imagepng($output);
imagedestroy($output);
?>

O exemplo acima produzirá algo semelhante a:

Exemplo #6 Exemplo de dispersão com imagefilter()

<?php
// Carrega a imagem
$logo = imagecreatefrompng('./php.png');

// Aplica um efeito bem leve de dispersão à imagem
imagefilter($logo, IMG_FILTER_SCATTER, 3, 5);

// Mostra a imagem com o efeito de dispersão
header('Content-Type: image/png');
imagepng($logo);
imagedestroy($logo);
?>

O exemplo acima produzirá algo semelhante a:

Saída do exemplo: dispersão com imagefilter()

Notas

Nota: O resultado de IMG_FILTER_SCATTER é sempre aleatório.

Veja Também

imageconvolution() - Aplica uma matriz de convolução 3x3, usando coeficiente e deslocamento

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Notas Enviadas por Usuários (em inglês) 24 notes

down

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.

down

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;
}
?>

down

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);

        }

    }

}

?>

down

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 );
?>

down

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.

down

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.';
}
?>

down

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.

down

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.

down

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);
        }
}
?>

down

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.

down

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]);
}
?>

down

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);

?>

down

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);
?>

down

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.

down

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.

down

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.

down

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);
}

down

-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);
?>

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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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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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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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Padde ¶

11 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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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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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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