Global Variable



const CFStringRef kCGImageSourceCreateThumbnailFromImageAlways;


Whether a thumbnail should be created from the full image even if a thumbnail is present in the image source file. The thumbnail is created from the full image, subject to the limit specified by kCGImageSourceThumbnailMaxPixelSize. If a maximum pixel size isn't specified, then the thumbnail is the size of the full image, which probably isn't what you want. This key must be a CFBoolean value. The default value is kCFBooleanFalse. This key can be provided in the options dictionary that you can pass to the function CGImageSourceCreateThumbnailAtIndex.

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