Imagick
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Imagick::setImageColorspace

(PECL imagick 2.0.0)

Imagick::setImageColorspace — Sets the image colorspace

说明

bool Imagick::setImageColorspace ( int $colorspace )

Sets the image colorspace.

参数

colorspace

返回值

成功时返回 TRUE .

错误/异常

错误时抛出 ImagickException .

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PHP手册 - N: Sets the image colorspace

用户评论:

eth at ethaniel dot com (29-Feb-2012 02:15)

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):

// 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)

mettedraq at gmail dot com (01-Jul-2010 08:21)

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;
?>

charlie at midsouthhost dot com (07-May-2010 05:45)

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.

jdstraughan dot com at gmail dot com (26-Sep-2008 08:16)

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