3 ms·
Incorrect. PNG does not do reconstruction, just delta compression. By applying a diagonal blur, he is removing entropy in a way that the lossless compressor is
by maaku 13y ago
Incorrect. PNG does not do reconstruction, just delta compression. By applying a diagonal blur, he is removing entropy in a way that the lossless compressor is likely to take advantage of.
- Terretta 13y agoI didn't say PNG did anything, so I'm neither correct nor incorrect about what PNG does (though on second read compressing is a better word than omitting, though either way the "guessed" pixel is where the information goes missing). I'm disputing parent's claim author said savings was from blur. He didn't. He said: > PNG has an ability to “guess” pixels based on their top and left neighbors and successful guesses compress to almost nothing. Usually only few pixels match a guess, but latest ImageAlpha's “Blurizer” option manipulates image data to match the guesses, making compression much much more effective.
- maaku 13y agoWhat he said is correct.