Yikes! Yes, converting our PNGs to "indexed" is a very bad idea -
the conversion, like any conversion of an image into a 8-bit color
space, is generally lossy. Indexed PNGs, or PNG-8s, by their other
name, are 8-bit by definition, and many of our images, especially
mine or wayfarer's, use more than an 8-bit color space. Converting
down to this typically shifts all of the colors in the image,
slightly. In very basic principle, it might have conferred some
space savings, but in practice, that is really only through
discarding data, since the folks who made the PNG-24 spec did a
pretty good job.
Also, various software programs have niggling incompatibilities with
png-8s.
I've learned this only through experience - some of the images that I
had been replacing for the team-color commit, I had made as png-8's
back in the day (c.f. human royal guard line). These I had to jump
through some serious hoops before I could import them into photoshop
(essentially, photoshop had de-linked and lost the mask, and I had to
export the file to a tiff via an alternate program, which recovered
the masking information, then import into photoshop and re-apply the
mask data, and then export the thing to a png-24). Evil, let me tell
ya.
Anyways, no hard feelings about goofing this up - I've certainly had
my fair share.
Frame's suggested fix is the way to go.
On Mar 14, 2006, at 3:42 AM, Hogne Håskjold wrote:
Hi
Torangan: Your PNG optimization has changed a lot more images than
I first thought. _All_ units that has been changed to indexed and
back have less saturation now and look far worse, and in addition
they no longer match the !changed pngs. This is becoming a huge
mess, and I think we should revert the entire opt. commit and all
subsequent attempt to fix it again. Since you got on in this mess
to begin with I think it's your responsibility to sort this out.
--
mvh (o_
Hogne Håskjold //\
V_/_
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