Juicy No.6 2014-07
[雑誌] ジューシー No.06 2014年07月号

Lossless optimization of the black and white pages, reduced file size from 926 MB to 481 MB.
Resolution and color pages are unchanged.
Original: #487739

Grayscale PNG should not be saved in 24-bit color. Changing them to indexed colors (or even grayscale) and running optipng, etc, significantly reduces size. Hopefully more scan groups will use it in the future.

Example P029.jpg from #488253:
http://screenshotcomparison.com/comparison/79392
3179 KB -> 1580 KB, lossless
(For comparison, quality 100 JPG is 2468 KB, quality 95 JPG is 1761 KB. So PNG beats JPG for clean B/W scans)

Quote:

Magazine Scanned by Team Comic ONE. Pure RAW and High quality. For more new magazine release, please visit Mikocon.com

http://www.mikocon.com/forum.php?mod=forumdisplay&fid=46