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In EZTwain classic the only transfer mode (1 out of 3) implemented is the native transfer. Which means it will save the data to a DIB in memory. No compression.
By “g4” I don’t mean the CPU previously used in macs, but the CCITT Group 4 compression for black&white images used in fax machines, which is the best compression around for b&w images and is supported in the TWAIN driver of some scanners. You can usually setup that for TIFF files, if your model does support it.
The window for TWAIN messages is solved by creating a proxy window (not visible) to receive them. If I remember correctly EZTwain already does this. The C code for Visual Studio 6 in the “Vc” directory should have the implementation.