[GloriousCow]

For the ones that I make to look pretty, the data is colored in buckets of 8 bits, using the bit-count per byte to select a shade in 8 steps from 0-255. So there's at least 8 times less data than you would need. Then it is downsampled 4x to get nice antialiasing, so that is more data loss.

I do have a bit-mode, and if you rendered at high enough resolution you could do it, maybe something like 32k x 32k. But this is a very inefficient way to store a disk image. :)