Detect and convert CMYK jpg images to RGB

Does anyone have a php script that will not only detect if a jpg image is CMYK, but will also convert it to RGB if found?


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LinuxNubbAuthor Commented:
Very nice article, but it doesn't have anything that about detecting if an image is already cmyk, and converting it.

I basically want to see if an image is cmyk, and if it is then convert it to rgb.  Any more ideas?
You can use ImageMagick. Here:

this is a command line tool that you can access from PHP.. I believe specifically the command you are looking for is:

convert -colorspace RGB oldcymk.jpg jpg:newrgb.jpg

so in php you'd run exec('convert -colorspace RGB oldcymk.jpg jpg:newrgb.jpg');

I believe it will leave it alone if the image does not need conversion. See how that works for you?

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Marcus BointonCommented:
Stormist is right. There's another option for identifying the image format in the first place though - ImageMagick has an identify function:

Probably best to use that before trying to convert images that don't need converting.
LinuxNubbAuthor Commented:
Very good.  So there is a way, but not natively.

Thanks Gents!
Marcus BointonCommented:
There is an ImageMagick PHP extension in PECL that makes these functions native, but it's been stagnant for years: You're better off using the exec() approach. I wouldn't want to do image processing stuff in PHP itself.
LinuxNubbAuthor Commented:
It's not real intensive, so it wouldn't be too bad.  It's basically if a someone uploads a CMYK image, which should not happen often at all, to detect it and convert it.

Thanks for the info though again.
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