[wp-trac] [WordPress Trac] #47873: Introduce handling of "Big Images"

[WordPress Trac]

#47873: Introduce handling of "Big Images"
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 Reporter:  azaozz       |       Owner:  (none)
     Type:  enhancement  |      Status:  new
 Priority:  normal       |   Milestone:  5.3
Component:  Media        |     Version:
 Severity:  normal       |  Resolution:
 Keywords:               |     Focuses:
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Comment (by azaozz):

 Related #47872, #14459, #14459, #32437.

 As far as I see the simplest, backwards-compatible and sufficiently
 future-proof solution is to:

 1. Detect when an image is "big". This should be by looking at both file
 size and dimensions and would need some comparison data. For example a
 3000 x 2250 JPEG image is "big" if the file size is over 1600KB, etc. This
 test may also include looking at EXIF orientation data. An edited image
 would always have that set to 1 (proper orientation).

 2. When an image is big, create a "web optimized maximum size" of it. Then
 use that max-size as the largest available size in WordPress. There is an
 edge case when the original image dimensions match the max-size
 dimensions. Then it should still create the max-size if the file size is
 over the limit, and can compare the file sizes.

 On the technical side that would need only a small change to how we store
 image meta. When there is a big image, the "full" size would be the path
 to the max-size created after uploading, and the original image path would
 be in `original-image`. Alternatively we can add separate meta key for it.

 Then these "original images" will be available for downloading from the
 Media Library for users that use WP as online albums/image storage (in
 case they want to print them, etc.). They also will be available for
 making additional image sub-sizes in the future.

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Ticket URL: <https://core.trac.wordpress.org/ticket/47873#comment:2>
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