Specify how color values are stored.
The ColorSync bitmap data type
CMBitmap includes a field that identifies the color space in which the color values of the bitmap image are expressed. This enumeration defines the types of packing for a color space’s storage format. The enumeration also defines an alpha channel that can be added as a component of a color value to define the degree of opacity or transparency of a color. These constants are combined with the constants described in Abstract Color Space Constants to create values that identify a bitmap’s color space. Your application does not specify color packing constants directly, but rather uses the combined constants, which are described in
cm64 were added in ColorSync version 2.5.