Can i convert colorspace of jpg image, without using third-party libraries like Imagick. WIth using native php functions only.
Convert colorspace of image in PHP (RGB to CMYK) without php-extensions like Imagick
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There are a lot of color extraction and management functions exposed by GD extension which is bundled with PHP. http://php.net/manual/en/ref.image.php
Note that CMYK support was added in 2.0.22 of The GD extension.