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Using just the image viewer program IRFANVIEW, I did the following:
1. Image Pulldown menu --> convert to grayscale
2. Image Pulldown menu --> decrease color depth 16
3. Image Pulldown menu --> decrease color depth - custom 8
4. Shift U
5. Image Pulldown menu --> decrease color depth - custom 4
6. Image Pulldown menu --> decrease color depth - custom 3
7. Image Pulldown menu --> decrease color depth 2
There were so many steps since I simply "nibbled" my way along experimentally (out of curiousity) without trying to improve the method with fewer steps.
