imagefilter

(PHP 5, PHP 7)

imagefilterApplique un filtre à une image

Description

bool imagefilter ( resource $image , int $filtertype [, int $arg1 [, int $arg2 [, int $arg3 [, int $arg4 ]]]] )

imagefilter() applique le filtre filtertype à l'image en utilisant les paramètres args1, args2 et args3 lorsque cela est nécessaire.

Liste de paramètres

image

Une ressource d'image, retournée par une des fonctions de création d'images, comme imagecreatetruecolor().

filtertype

Le paramètre filtertype peut prendre l'une des valeurs suivantes :

  • IMG_FILTER_NEGATE : renverse toutes les couleurs de l'image.
  • IMG_FILTER_GRAYSCALE : convertit l'image en grayscale. convertit l'image en niveaux de gris en changeant les composants rouge, vert et bleu en leur somme pondérée à l'aide des mêmes coefficients que le calcul de la luminance REC.601 luma (Y'). Les composants alpha sont conservés. Pour les images de palette, le résultat peut différer en raison des limitations de palette.
  • IMG_FILTER_BRIGHTNESS : modifie la luminosité de l'image. Utilisez le paramètre args1 pour définir la luminosité. L'intervalle de la luminosité est de -255 à 255.
  • IMG_FILTER_CONTRAST : modifie le contraste de l'image. Utilisez le paramètre args1 pour définir le contraste.
  • IMG_FILTER_COLORIZE : identique au paramètre IMG_FILTER_GRAYSCALE excepté que vous pouvez spécifier une couleur. Utilisez trois arguments séparés dans les paramètres args1, args2 et args3 sous la forme red, green, blue et arg4 pour le canal alpha. L'intervalle pour chaque couleur est 0 - 255.
  • IMG_FILTER_EDGEDETECT : utilise la détection des bords pour les mettre en évidence dans l'image.
  • IMG_FILTER_EMBOSS : grave l'image en relief.
  • IMG_FILTER_GAUSSIAN_BLUR : brouille l'image en utilisant la méthode gaussienne.
  • IMG_FILTER_SELECTIVE_BLUR : brouille l'image.
  • IMG_FILTER_MEAN_REMOVAL : son utilisation signifie le déplacement pour réaliser un effet "peu précis".
  • IMG_FILTER_SMOOTH : rend l'image lissée (smooth). Utilisez le paramètre args1 pour définir le degré de lissoir.
  • IMG_FILTER_PIXELATE : applique un effet de pixelisation à l'image; utilise arg1 pour indiquer la taille de bloc, et arg2 pour indiquer le mode de pixelisation.

arg1

  • IMG_FILTER_BRIGHTNESS : degré de luminosité.
  • IMG_FILTER_CONTRAST : degré du contraste.
  • IMG_FILTER_COLORIZE : Valeur du composant rouge.
  • IMG_FILTER_SMOOTH : degré du lissé.
  • IMG_FILTER_PIXELATE: taille de bloc en pixels.

arg2

  • IMG_FILTER_COLORIZE : Valeur du composant vert.

arg3

  • IMG_FILTER_COLORIZE : Valeur du composant bleu.

arg4

  • IMG_FILTER_COLORIZE : canal Alpha. Une valeur entre 0 et 127. 0 signifie totalement opaque, tandis que 127 signifie totalement transparent.
  • IMG_FILTER_PIXELATE: s'il faut utiliser un effet de pixelisation avancé ou non (par défaut, FALSE).

Valeurs de retour

Cette fonction retourne TRUE en cas de succès ou FALSE si une erreur survient.

Historique

Version Description
5.3.0 Support de la pixelisation (IMG_FILTER_PIXELATE) ajouté.
5.2.5 Le support du canal Alpha pour la constante IMG_FILTER_COLORIZE a été ajouté.

Exemples

Exemple #1 Exemple avec imagefilter()

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

if(
$im && imagefilter($imIMG_FILTER_GRAYSCALE))
{
    echo 
'Image convertie en grayscale.';

    
imagepng($im'dave.png');
}
else
{
    echo 
'La conversion en grayscale a échoué.';
}

imagedestroy($im);
?>

Exemple #2 Exemple avec imagefilter()

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

if(
$im && imagefilter($imIMG_FILTER_BRIGHTNESS20))
{
    echo 
'La luminosité de l\'image a été modifiée.';
    
imagepng($im'sean.png');
    
imagedestroy($im);
}
else
{
    echo 
'Echec lors de la modification de la luminosité.';
}
?>

Exemple #3 Exemple avec imagefilter()

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

/* R, G, B, donc 0, 255, 0 correspond au vert */
if($im && imagefilter($imIMG_FILTER_COLORIZE02550))
{
    echo 
'L\'image a été ombragée en vert avec succès.';
    
imagepng($im'philip.png');
    
imagedestroy($im);
}
else
{
    echo 
'Echec lors de la modification de l\'ombrage.';
}
?>

Exemple #4 Exemple d'image en négatif avec imagefilter()

<?php
// Définition de notre fonction "négatif" afin qu'elle soit portable
// également sur les versions de PHP qui n'ont pas la fonction imagefilter()
function negate($im)
{
    if(
function_exists('imagefilter'))
    {
        return 
imagefilter($imIMG_FILTER_NEGATE);
    }

    for(
$x 0$x imagesx($im); ++$x)
    {
        for(
$y 0$y imagesy($im); ++$y)
        {
            
$index imagecolorat($im$x$y);
            
$rgb imagecolorsforindex($index);
            
$color imagecolorallocate($im255 $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 convertie avec succès en couleur négative.';

    
imagejpeg($im'kalle.jpg'100);
    
imagedestroy($im);
}
else
{
    echo 
'Echec lors de la conversion en couleur négative.';
}
?>

Exemple #5 Exemple de pixelisation avec imagefilter()

<?php
// Chargement du logo PHP, nous avons besoin de deux instances.
$logo1 imagecreatefrompng('./php.png');
$logo2 imagecreatefrompng('./php.png');

// Crée une image sur laquelle nous voulons montrer les différences
$output imagecreatetruecolor(imagesx($logo1) * 2imagesy($logo1));

// Applique la pixelisation à chaque instance, avec un bloc de 3
imagefilter($logo1IMG_FILTER_PIXELATE3);
imagefilter($logo2IMG_FILTER_PIXELATE3true);

// Fusion des différences dans l'image finale
imagecopy($output$logo10000imagesx($logo1) - 1imagesy($logo1) - 1);
imagecopy($output$logo2imagesx($logo2), 000imagesx($logo2) - 1imagesy($logo2) - 1);
imagedestroy($logo1);
imagedestroy($logo2);

// Affichage des différences
header('Content-Type: image/png');
imagepng($output);
imagedestroy($output);
?>

L'exemple ci-dessus va afficher quelque chose de similaire à :

Affichage de l'exemple : imagefilter()

Notes

Voir aussi

  • imageconvolution() - Applique une matrice de la convolution 3x3, en utilisant le coefficient et l'excentrage

add a note add a note

User Contributed Notes 25 notes

up
21
PanuWorld
10 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
10
martijn at martijnfrazer dot nl
3 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
4 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
3
hadrien dot jouet at grownseed dot net
6 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
7
aiden dot mail at freemail dot hu
9 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
2
bushmakin stas (bushstas at mail dot ru)
6 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
cookie at backbone dot sk
5 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
shahilahmed4242 at gmail dot com
1 year 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 );
up
2
michaeln no at spam associationsplus ca
10 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.
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2
10 years ago
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10 years ago
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10 years ago
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1
10 years ago
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5 years ago
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5 years ago
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6 years ago
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6 years ago

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6 years ago
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9337" class="name">
6 years ago
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6 years ago
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6 years ago
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9337" class="name">
6 years ago
fo=$c;iv arave="_blank">http://www.hudzunla.org/>
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6 years ago

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6 years ago
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6 years ago
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