General PNG optimization #348
Description
Hi, I've been working here optimizing the PNGs for size.
Used Fileoptimizer that runs some png optimizers serially, too slow (weeks of processing). But found some good compromise in terms of final size and compression time. There is a small loss in the image, not visible even with zooming and just relative to quantization (first step is pngquant), other things as re-compression, huffmann optimizations or stripping tags are lossless.
As other user said, pngs with alpha channel must be checked, AFAIK this is not important in boxes, snaps and titles as they are simple scans or snapshots.
If there is interest in this I can show the process i've choosen (pngquant, truepng, defluff,...) and could try to code a python script for processin the whole set.