Imagick::setColorspace

(PECL imagick 3)

Imagick::setColorspace — Set colorspace

说明

public Imagick::setColorspace ( int $COLORSPACE ) : bool

Sets the global colorspace value for the object. 此方法在Imagick基于ImageMagick 6.5.7以上版本编译时可用。

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。

User Contributed Notes

simonjjarrett at gmail dot com 26-Mar-2020 05:29


This method has to be called BEFORE any files are loaded into the Imagick object.



By default, Imagick will incorrectly read CMYK PDFs - it will read each channel as a greyscale page resulting in 4 times the number of pages. By specifying the desired colorspace (usually SRGB) before reading the file, GhostScript will automatically convert it.



<?php

$im = new Imagick();



// set the sampling resolution

$im->setResolution(200,200);



// set the desired format

$im->SetColorspace(Imagick::COLORSPACE_SRGB);



$im->readimage($file['tmp_name']);

?>

T 28-Dec-2014 09:20


Right now this function doesn't appear to do anything, ref: http://stackoverflow.com/q/10739822/2685496





As mentioned in the answer, modulateImage works fine as a replacement for converting to gray scale.





<?php





$image = new Imagick("input.jpg");





$image->modulateImage(100, 0, 100);





$image->writeImage("output.jpg");





$image->clear();





?>