Carl Lowenstein wrote:
It must be hard to generate an image that is useful and not compressible. Useful in the sense that it is mostly a background (white) with a moderate amount of stuff (black) scattered about. LIke text on a page. Or even circuit layouts. I'm not sure about things like the sonar images that I used to work with, as dithered halftone representations. I think they were amenable to compression by the simplest imaginable scheme, run-length encoding.
Well, actual half-toning does a nice job of blowing compression completely out of the water. So does proper dithering rather than pattern dithering.
However, even if the compression works, you can very easily wind up with images that raster in O(n^2) time instead of O(n) because you have to uncompress and recompress in order to composite.
Photos also tend to demolish compression. Fortunately, they don't normally require compositing.
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