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Opened 12 years ago

Closed 11 years ago

#21498 closed enhancement (duplicate)

PNG optimizations

Reported by: demetris's profile demetris Owned by:
Milestone: Priority: normal
Severity: normal Version:
Component: Performance Keywords: has-patch
Focuses: Cc:


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:


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.


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)


Change History (3)

#2 @ocean90
12 years ago

  • Keywords close added

Duplicate: #19232

#3 @ocean90
11 years ago

  • Keywords 2nd-opinion close removed
  • Milestone Awaiting Review deleted
  • Resolution set to duplicate
  • Status changed from new to closed
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