Opened 10 months ago
Closed 9 months ago
#21498 closed enhancement (duplicate)
PNG optimizations
| Reported by: |
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Owned by: | |
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| Priority: | normal | Milestone: | |
| Component: | Performance | Version: | |
| Severity: | normal | Keywords: | has-patch |
| Cc: | dkikizas@… |
Description
I run a series of recompression commands on all PNG files found currently in trunk (rev. 21421, 121 images in total), and in some cases I got results that I think we should use.
I recorded the gains in a spreadsheet, which you can see here:
[URL]
The PNG files, along with the originals, are in the ZIP archive I link. Originals are distinguished by their double extension: .ORIG.png. Note that the ZIP contains all pairs of original and recompressed images; that is, it also includes those where no gain was achieved.
[URL]
In a couple of cases I noticed that the recompression messed up the images. I put a note for those in the Remarks column of the spreadsheet. Maybe there are more problematic cases.
The programs and arguments I used were:
- optipng -o7
- advpng -z -4 (advpng is part of the AdvanceCOMP suite)
- optipng -o7 (a second time)
Cheers!
Spreadsheet:
https://docs.google.com/spreadsheet/ccc?key=0AhDAjUtXxC-5dGh0SFo2aS0yZ2dvSUptQWtFYWhOTUE
ZIP archive:
http://op111.net/u/wp/t21498-png.zip