iphoneuiimagecgcolorspace

Determining the Colorspace of a UIImage

I'm wondering if there's an easy way to get the colorspace of an image (i.e. an image loaded into a UIImage)? For example, I have a TIFF image and I'd like to be able to determine if it uses the RGB colorspace or not. Is there an easy way to do this without manipulating pixel data? I know there's some CGColorSpace functions, but none of them seem to do this, just create colorspaces and manipulate them (and much more advanced functions).

Thanks in advance.

Solution

  • You have to get the color space through CGImage. You can do it with the following line of functions/properties:

    @property(nonatomic, readonly) CGImageRef CGImage

CGColorSpaceRef CGImageGetColorSpace (
   CGImageRef image
);

    So to get the color space of an image, you'd do:

    CGColorSpaceRef colorspace = CGImageGetColorSpace([myUIImage CGImage]);

    And of course, make sure to follow the get/create/copy rules for CG objects.