Imagick::setImageColorspace

(PECL imagick 2.0.0)

Imagick::setImageColorspace — Sets the image colorspace

说明

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() .

参数

colorspace: One of the COLORSPACE constants

返回值

成功时返回 TRUE 。

错误／异常

错误时抛出 ImagickException。

用户评论:

[#1] pilot114 at bk dot ru [2015-01-22 13:58:33]

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).

[#2] kevin.a.florida [2013-06-15 15:53:56]

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=========================|

[#3] eth at ethaniel dot com [2012-02-28 18:15:08]

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) ?>

[#4] mettedraq at gmail dot com [2010-07-01 12:21:28]

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; ?>

[#5] charlie at midsouthhost dot com [2010-05-06 21:45:46]

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.

[#6] jdstraughan dot com at gmail dot com [2008-09-26 12:16:11]

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