Imagick::setImageColorspace

(PECL imagick 2, PECL imagick 3)

Imagick::setImageColorspace — Configure l'espace de couleurs de l'image

Description

public Imagick::setImageColorspace(int $colorspace): bool

Configure l'espace de couleurs de l'image. Cette méthode doit être utilisée lors de la création de nouvelles images. Pour changer l'espace de couleurs d'une image existante, vous devez utiliser la méthode Imagick::transformImageColorspace().

Liste de paramètres

colorspace: Une des constantes COLORSPACE

Valeurs de retour

Retourne true en cas de succès.

Erreurs / Exceptions

Lance une exception ImagickException si une erreur survient.

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User Contributed Notes 8 notes

down

eth at ethaniel dot com ¶

12 years ago

When converting from CMYK to RGB using this function, the image can become inverted. To fix this, use a workaround (don't forget to download the .icc files online): 



<?php 

// don't use this (it inverts the image) 

//    $img->setImageColorspace (imagick::COLORSPACE_RGB); 



if ($img->getImageColorspace() == Imagick::COLORSPACE_CMYK) { 

   $profiles = $img->getImageProfiles('*', false); 

   // we're only interested if ICC profile(s) exist 

   $has_icc_profile = (array_search('icc', $profiles) !== false); 

   // if it doesnt have a CMYK ICC profile, we add one 

   if ($has_icc_profile === false) { 

       $icc_cmyk = file_get_contents(dirname(__FILE__).'/USWebUncoated.icc'); 

       $img->profileImage('icc', $icc_cmyk); 

       unset($icc_cmyk); 

   } 

   // then we add an RGB profile 

   $icc_rgb = file_get_contents(dirname(__FILE__).'/sRGB_v4_ICC_preference.icc'); 

   $img->profileImage('icc', $icc_rgb); 

   unset($icc_rgb); 

} 



$img->stripImage (); // this will drop down the size of the image dramatically (removes all profiles) 

?>

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pilot114 at bk dot ru ¶

9 years ago

Simlest way converting from CMYK to RGB:

<?php
if ($jpeg->getImageColorspace() == \Imagick::COLORSPACE_CMYK) {
    $jpeg->transformimagecolorspace(\Imagick::COLORSPACE_SRGB);
}
?>

It is pretty work in current stable Image Magick (6.9.0-4).

down

jdstraughan dot com at gmail dot com ¶

16 years ago

FYI, here is the breakdown for (int $colorspace):

Constants:
0 - UndefinedColorspace    
1 - RGBColorspace    
2 - GRAYColorspace    
3 - TransparentColorspace    
4 - OHTAColorspace    
5 - LABColorspace    
6 - XYZColorspace    
7 - YCbCrColorspace    
8 - YCCColorspace    
9 - YIQColorspace    
10 - YPbPrColorspace    
11 - YUVColorspace    
12 - CMYKColorspace    
13 - sRGBColorspace    
14 - HSBColorspace    
15 - HSLColorspace    
16 - HWBColorspace

down

kevin.a.florida ¶

11 years ago

I have a better solution for solving inverted colors on php 5.3.x than posted.  All the other solutions I found darkens the image or messes with the colors.

See below (note: my imagick object is $jpeg)

$range = $jpeg->getQuantumRange();
            $php_vs_arr = preg_split("/\./", phpversion());
            $php_vs = $php_vs_arr[0] . '.' . $php_vs_arr[1];
            if ($jpeg->getImageColorspace() == Imagick::COLORSPACE_CMYK) {
                    
                //make sure cmyk color-space is set correctly
                $jpeg->setImageColorspace(12);
                    
                // then we add an RGB profile
                $icc_rgb = file_get_contents(FRAMEWORK_PATH . DS . 'color' . DS . 'AdobeRGB1998.icc');
                $jpeg->profileImage('icc', $icc_rgb);
                unset($icc_rgb);
                    
                //set color space to rgb
                $jpeg->setImageColorspace(13);
            
                //fix gamma, hue, saturation, brightness
                if($php_vs < 5.3) {
                    //ADJUST GAMMA BY 20% for 5.2.x
                    $jpeg->levelImage(0, 2.0, $range['quantumRangeString']);
                } else {
                    //php 5.3 hack FOR INVERTED COLORS
                    $jpeg->negateImage(false, Imagick::CHANNEL_ALL);
                }
                    
            }
            $jpeg->stripImage();
            //end convert to RGB=========================|

down

Cesare Bordi ¶

6 years ago

These are the basic steps to convert an image from RGB to CMYK:

$image = new Imagick();
$image->readImage(rgb.jpg);
$image->setImageColorSpace(Imagick::COLORSPACE_CMYK);
$image->profileImage('icc', file_get_contents(/path/CoatedFOGRA27.icc'));
$image->negateImage(FALSE, imagick::COLOR_CYAN);
$image->negateImage(FALSE, imagick::COLOR_MAGENTA);
$image->negateImage(FALSE, imagick::COLOR_YELLOW);
$image->negateImage(FALSE, imagick::COLOR_BLACK);
$image->writeImage(cmyk.rgb);

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mettedraq at gmail dot com ¶

14 years ago

This is how to Monochrome a jpg [on Windows].. since I couldn't find it anywhere else.



<?php

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



$IMagick = new IMagick('c:\\testing\\fruit.jpg');

$IMagick->setImageColorSpace(Imagick::COLORSPACE_GRAY);



echo $IMagick;

?>

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charlie at midsouthhost dot com ¶

14 years ago

If your getting strange/bad color rendering from a PDF, after trying the colorspace constants noted by jdstraughan, try other values outside that range.

In one case for me only $image->setImageColorSpace(22) provided useful color. I have found posts elsewhere using values up to 255.

down

-2

cesarebordi ¶

6 years ago

These are the basic steps to convert an image from RGB to CMYK:

$image = new Imagick();
$image->readImage(rgb.jpg);
$image->setImageColorSpace(Imagick::COLORSPACE_CMYK);
$image->profileImage('icc', file_get_contents(/path/CoatedFOGRA27.icc'));
$image->negateImage(FALSE, imagick::COLOR_CYAN);
$image->negateImage(FALSE, imagick::COLOR_MAGENTA);
$image->negateImage(FALSE, imagick::COLOR_YELLOW);
$image->negateImage(FALSE, imagick::COLOR_BLACK);
$image->writeImage(cmyk.rgb);

For more information: 
http://www.cesarebordi.it/imagemagick-php-convertire-rgb-to-cmyk-web-developer/

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