[wp-trac] [WordPress Trac] #36477: Responsive images(srcset) feature makes images fatter.

[WordPress Trac]

#36477: Responsive images(srcset) feature makes images fatter.
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 Reporter:  peterdavehello  |       Owner:  joemcgill
     Type:  defect (bug)    |      Status:  accepted
 Priority:  normal          |   Milestone:  4.6
Component:  Upload          |     Version:  4.4.2
 Severity:  normal          |  Resolution:
 Keywords:  needs-patch     |     Focuses:  performance
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Comment (by azaozz):

 > the resized and smaller images are much larger than the origin image,
 especially for the optimized images.

 I'm thinking we need a better workflow for people that optimize their
 images before uploading them. Currently the steps are:
 1. Upload optimized image. WordPress creates non-optimized sub-sizes and
 the image meta to go with them.
 2. Create images with the exact dimensions like the WordPress sub-sizes.
 3. Rename them to match the file names generated by WordPress.
 4. Upload the optimized sub-size images with FTP replacing the non-
 optimized.

 Of course setting GD and Imagick to create optimized images would be best,
 but I'm not sure if we can enhance that further.

 Another possibility is to make a case with the hosting companies to
 install one of the jpeg optimizers (libjpeg/jpegtran?) and add cron job to
 scan the uploads directory and optimize the sub-sizes (if they don't do
 that already). This will reduce both bandwidth and space usage :)

 In WordPress we could probably make the uploader "recognize" when the user
 is uploading a sub-size of an image and just replace the file instead of
 treating it as a new upload. That will let the users create optimized sub-
 sizes and upload them together.

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Ticket URL: <https://core.trac.wordpress.org/ticket/36477#comment:8>
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