URL:
<http://gna.org/bugs/?11676>
Summary: Optimizing PNG images
Project: Battle for Wesnoth
Submitted by: None
Submitted on: Tuesday 05/13/2008 at 11:38 CEST
Category: Feature Request
Severity: 1 - Wish
Priority: 5 - Normal
Item Group: Graphics
Status: None
Privacy: Public
Assigned to: None
Originator Email: [EMAIL PROTECTED]
Open/Closed: Open
Discussion Lock: Any
Release: 1.4.2
Operating System: All
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Details:
I noticed that most of the PNG images in wesnoth could be more optimized
using advdef to optimize the deflate compression and save another 1-4%. Note
that advdef have to be performed after optipng (which appears to have been
already run with some settings which don't remove informations useful to
artists) or you could loose some compression advantages.
This is what I am doing (note the multiple runs of advdef: sometimes lower
compression levels compress better):
find . -name "*.png" -exec advdef -z -4 '{}' \;
find . -name "*.png" -exec advdef -z -3 '{}' \;
find . -name "*.png" -exec advdef -z -2 '{}' \;
find . -name "*.png" -exec advdef -z -1 '{}' \;
Note that after using advdef the --enable-optipng configure option will be
probably useless since probably will not shrunk anymore the images (optipng
performs a good job with the internal structure of the PNG but is not very
good in the last stage of deflate compression; advdef acts only on the
deflate compression, so if optipng is run after, it could improve the PNG
structure, but probably the final size will be bigger since it has a weaker
final deflate compressor).
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