[Webkit-unassigned] [Bug 51719] [chromium] PNG compression settings optimized for speed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=51719





--- Comment #1 from Cosmin Truta <ctruta at chromium.org>  2010-12-29 12:07:23 PST ---
Oh, and I forgot the conclusion:

In my experience with PNG compression, the speed-optimized parameters to use are the following:
zc=3 (zc=1 and zc=2 are too low; zc=4 uses lazy matching)
f=1, zs=1, zm=9 (for RGB, RGB+alpha, grayscale and grayscale+alpha images with 8 or more bits per sample)
f=0, zs=0, zm=8 (for palette images, and for grayscale images with less than 8 bits per sample -- not applicable to Chromium/WebKit)

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