[wp-trac] [WordPress Trac] #24380: Missing Compression Parameter in WP_Image_Editor_GD

[WordPress Trac]

#24380: Missing Compression Parameter in WP_Image_Editor_GD
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 Reporter:  MuViMoTV                             |       Owner:
     Type:  enhancement                          |  wonderboymusic
 Priority:  normal                               |      Status:  reopened
Component:  Media                                |   Milestone:  Future
 Severity:  normal                               |  Release
 Keywords:  has-patch dev-feedback needs-        |     Version:  3.5.1
  refresh                                        |  Resolution:
                                                 |     Focuses:
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Comment (by mikemanger):

 Given the 4.5 ImageMagick improvements, I decided to do some GD testing -
 I averaged 100 runs for each compression level. It isn't particularly
 scientific as I haven't removed outliers and, more importantly, haven't
 profiled the memory usage.

 Here are the results I got against a 143KB (146270 bytes) screenshot of
 this page saved in MS paint:

 ||= Level =||= Time (seconds) =||= Size (bytes) =||
 || 0 || 0.0552 || 3722124 ||
 || 1 || 0.044 || 146909 ||
 || 2 || 0.0439 || 145171 ||
 || 3 || 0.044 || 143488 ||
 || 4 || 0.0589 || 128725 ||
 || 5 || 0.0603 || 127968 ||
 || '''6''' || '''0.0642''' || '''127312''' ||
 || 7 || 0.0666 || 126933 ||
 || 8 || 0.0959 || 125587 ||
 || 9 || 0.1903 || 125195 ||

 '''Not passing a quality level gives the same result as 6''', which is the
 default on most servers (it can be changed at PHP compile time or
 php.ini).

 I tried some larger images and got more or less the same results - the
 difference between 8/9 can be much bigger but so can the process time
 (sometimes 3 times longer).

 I guess the decision is to either:

 * leave it is as it is
 * change the default to something else
 * and/or allow for people to filter the value.

 I'm honestly not sure it matters as even then Google PageSpeed will likely
 still complain with most images as I was able to compress the same image
 down to 90KB using optipng.

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Ticket URL: <https://core.trac.wordpress.org/ticket/24380#comment:48>
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