Arg! You're right! That's how I did it originally, but I thought I had it wrong.

There are 2^(24*640*480) true colour 640x480 images. That's a number with over 2211840 digits. Considering a googol has only 101 digits and "a googol is much larger than the number of atoms in the Universe", your goal is unfeasable.

Even if we used 128x128x16 thumbnails, it's still unfeasable at 2^(4*128*128), a number with over 19660 digits.

There is over a googol of 20x20 monochrome images. (Over 2.58 * 10^120, to be more precise.)

In reply to Re^7: Very Large Hex Combinations by ikegami
in thread Very Large Hex Combinations by danambroseUK

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