Imagick::setImageColorspace

(PECL imagick 2.0.0)

Imagick::setImageColorspace — Sets the image colorspace

Description

bool Imagick::setImageColorspace ( int $colorspace )

Sets the image colorspace. This method should be used when creating new images. To change the colorspace of an existing image, you should use Imagick::transformImageColorspace().

Parameters

colorspace: One of the COLORSPACE constants

Return Values

Returns TRUE on success.

Errors/Exceptions

Throws ImagickException on error.

User Contributed Notes

eth at ethaniel dot com

4 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) 

?>

kevin.a.florida

2 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=========================|

jdstraughan dot com at gmail dot com

7 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

pilot114 at bk dot ru

1 year 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).

charlie at midsouthhost dot com

5 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.

mettedraq at gmail dot com

5 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;

?>