[wp-trac] [WordPress Trac] #21668: WordPress still does not save jpeg as progressive jpeg

[WordPress Trac]

#21668: WordPress still does not save jpeg as progressive jpeg
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 Reporter:  _ck_                               |       Owner:
     Type:  enhancement                        |      Status:  new
 Priority:  normal                             |   Milestone:  Future
Component:  Media                              |  Release
 Severity:  normal                             |     Version:  3.4.1
 Keywords:  has-patch 3.7-early needs-testing  |  Resolution:
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Comment (by markoheijnen):

 Replying to [comment:23 pmeenan]:
 > Replying to [comment:22 nacin]:
 > > While progressive JPEGs can be smaller, they are not always desired
 from an aesthetics standpoint.
 > >
 > > I am not inclined to support [attachment:21668.5.patch] as it appears
 to change functionality, and/or increase the requirements for GD or
 Imagick to be used. Please correct me if I am mistaken on these points.
 >
 > It doesn't change the requirements for GD or Imagick.  The only change
 is to set the progressive flag in cases where GD or Imagick were already
 being used to save JPEGs (resize or edit).
 >
 > As far as the asthetics go, I can't really say because I'm not aware of
 any studies that have been done to evaluate end-user's perception of
 either baseline (top-down rendering) or progressive.  I do know lots of
 individual developers have strong opinions one way or another and there
 are plenty in both camps but I'm not aware of any data either way.
 >
 > I do have data backing the faster visual experience (not just of the
 blurry initial passes) but that doesn't really address user perceptions
 and asthetics.

 Nacin is right about the possibility to raise the requirements. In case of
 Imagick the check happens on load. I change that logic now. Not sure what
 you think about this way.

 Since Imagick supports I wonder if we should limit the possibilities in
 Imagick to only allow it on png, gif and jpg.

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Ticket URL: <http://core.trac.wordpress.org/ticket/21668#comment:26>
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