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

[WordPress Trac]

#21668: WordPress does not save jpeg as progressive jpeg
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 Reporter:  _ck_         |       Owner:
     Type:  enhancement  |      Status:  assigned
 Priority:  normal       |   Milestone:  Future Release
Component:  Media        |     Version:  3.4.1
 Severity:  normal       |  Resolution:
 Keywords:  needs-patch  |     Focuses:
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Comment (by lukecavanagh):

 Granted a better image format does exist in the form on WebP.
 https://developers.google.com/speed/webp/

 Replying to [comment:43 bahia0019]:
 > Replying to [comment:22 nacin]:
 > > While progressive JPEGs can be smaller, they are not always desired
 from an aesthetics standpoint.
 >
 > Yes! FOUT anyone? Now FOUP. Flash of Unstyled Picture...
 > Progressive JPGs alter the aesthetic experience of a site. And while it
 may be something for a site owner to consider, it should be their choice
 on whether to utilize or not.
 > Similarly, lazy loaders are not baked into Core.
 > The psychology of how people interact with progressive jpegs can be read
 here:
 > http://www.webperformancetoday.com/2014/09/17/progressive-image-
 rendering-good-evil/
 > TL;DR: the brain has to figure out what they're loooking at when they
 see a blurry image, then acknowledge what the object actually is when it's
 finally rendered. (This is very much in contrast with the Don't Make Me
 Think philosophy).
 >
 > I could see this potentially as an option in the Media settings, but
 then you're dealing with regenerating all the jpegs (and doing the same
 when/if switching back).
 >
 > This is something a site owner should be responsible for IF they want to
 pursue it. And when the average Progressive JPG only saves a few
 percentage points, there are other areas to focus on. Lossless compression
 saves way more (25-60% in cases) than Progressive JPGs, without the
 aesthetic issues.
 >
 > Progressive JPEGs have been around forever, but we have better
 technology that allows for a much superior user experience. You can't
 trade usability/experience for a small performance improvement, when there
 are better options now.
 >
 > As a photographer, and as a internet user, I'm inclined to agree with
 Nacin, and not support this.

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Ticket URL: <https://core.trac.wordpress.org/ticket/21668#comment:44>
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