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Get a Rectangular area from a Bigimage

The GETMAP function returns an array containing the bytes from a given rectangular area of the bigimage, irrespective of lane boundaries. It has to be given the bigimage descriptor, the starting pixel count in X and Y, and the finishing pixel count in X and Y. No interpretation or type conversion is provided. It is left to the application program to ensure it interprets the returned bytes correctly as I2S or whatever.

SuperCOSMOS development
Tue Aug 20 12:02:13 BST 1996