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Old 17 June 2017, 13:48   #9
Join Date: Jul 2008
Location: Sweden
Posts: 2,265
Originally Posted by NorthWay View Post
AFAIK (corrections welcome) both IFF and GIF store picture data on a line by line basis.
Colours are typically much more locally clustered, and this is also how JPEG (and others?) arrange pixel data to take advantage of local similarities.
I played a bit with this a while back and found that rearranging the data according to a Hilbert-curve gave better compression for simple images, but it wasn't much, maybe 20% on monochrome images at best, and with higher bit-depths the difference was not worth it.

The compression gain is definitely there, but it's too little and too cumbersome to be of practical use.
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