[comp.sys.ibm.pc] Graphic Format Specs?

mark@intek01.UUCP (Mark McWiggins) (03/24/89)

We're writing a program to capture screen displays for use in Ventura
Publisher documents.  Ventura know about GEM, .PCX, and Mac format
graphic images.  Could someone point me toward a published description
of one or all of these formats? 

Thanks in advance.