Quick Reference :: PostScript Language
Operator: width height bpp data image
This operator draws a grayscale image in the unit square from (0,0) to (1, 1).
The source information is a raster image width pixels wide by height pixels high.
Each pixel is represented by bpp bits.
The data operand can be a number of things, but is usually a procedure that returns a string of bytes with the grayscale data each time it is called.
The procedure will be called repeatedly until all pixels have been processed.
The image is processed from left-to-right, top-to-bottom.
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Example :