Show HN: Using 2D DFT, dithering, etc. to maximize eInk manga image quality
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Show HN: Using 2D DFT, dithering, etc. to maximize eInk manga image quality
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Unofficial Hacker News client; not affiliated with Y Combinator.
brudgers · · focus · HN ↗
xyzsparetimexyz · · focus · HN ↗
fc417fc802 · · focus · HN ↗
seam_carver · · focus · HN ↗
chocochunks · · focus · HN ↗
I have slightly more sympathy for scientific papers due to smaller text and overall extra density but considering that it's pretty common for publishers themselves to release editions smaller than a typical 10.25x6.6 page, you don't really need page size (e.g., Archie's digests, every manga tankobon ever, DC Compact Comics).
trashb · · focus · HN ↗
seam_carver · · focus · HN ↗
<a href="https://github.com/ciromattia/kcc/issues/704" rel="nofollow">https://github.com/ciromattia/kcc/issues/704
xyzsparetimexyz · · focus · HN ↗
chocochunks · · focus · HN ↗
seam_carver · · focus · HN ↗
elli0t-yash · · focus · HN ↗
ragazzina · · focus · HN ↗
seam_carver · · focus · HN ↗
GnosiWorks · · focus · HN ↗
[dead]
maeln · · focus · HN ↗
seam_carver · · focus · HN ↗
smusamashah · · focus · HN ↗
seam_carver · · focus · HN ↗
But I prefer to preprocess on a pc to maximize ereader battery life.
smusamashah · · focus · HN ↗
seam_carver · · focus · HN ↗
And a rainbow removal plugin which uses same method.
seam_carver · · focus · HN ↗
1) filesize optimization. Think 600 to 100 mb after optimization per volume depending on source. Does it by downscaling and dithering from 256 to 16 shades of gray
2) black level correction. You need pure blacks in eink. Dark gray looks ok on paper and normal screens but not eink. Does it with histogram manipulation
3)semi automatic 2 page speed joining
4) rainbow removal on kaleido 3 color eink with discrete Fourier transform