[wp-trac] [WordPress Trac] #21498: PNG optimizations

[WordPress Trac]

#21498: PNG optimizations
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 Reporter:  demetris     |      Owner:
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  Awaiting Review
Component:  Performance  |    Version:
 Severity:  normal       |   Keywords:  has-patch 2nd-opinion
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 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!

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Ticket URL: <http://core.trac.wordpress.org/ticket/21498>
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