(PECL imagick 2, PECL imagick 3)
Imagick::setImageColorspace — Sets the image colorspace
public Imagick::setImageColorspace ( int $colorspace ) : bool
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().
colorspace
One of the COLORSPACE constants
Returns true on success.
Throws ImagickException on error.
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https://www.php.net/manual/en/imagick.setimagecolorspace.php