Imagick::setImageColormapColor
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)
?>
Imagick::setImageColorspace
(PECL imagick 2.0.0)
Imagick::setImageColorspace — Sets the image colorspace
Descrierea
bool Imagick::setImageColorspace
( int
$colorspace
)Sets the image colorspace.
Valorile întoarse
Întoarce TRUE în caz de succes.
Erori/Excepții
Emite ImagickException în caz de eroare.
add a note
User Contributed Notes
Imagick::setImageColorspace - [4 notes]
eth at ethaniel dot com ¶
1 year ago
mettedraq at gmail dot com ¶
2 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;
?>
charlie at midsouthhost dot com ¶
3 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.
jdstraughan dot com at gmail dot com ¶
4 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