Identifies an NSNumber object identifying the compression method of the image.
Used only for TIFF files. The value corresponds to one of the NSTIFFCompression constants, described below. It’s set when reading in and used when writing out.
Available in Mac OS X v10.0 and later.
Declaration Syntax Version Information- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)