[wp-trac] [WordPress Trac] #38847: Twenty Seventeen: Header Image used is smaller than 2000x1200px

[WordPress Trac]

#38847: Twenty Seventeen: Header Image used is smaller than 2000x1200px
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 Reporter:  transl8or      |      Owner:
     Type:  defect (bug)   |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  Bundled Theme  |    Version:  trunk
 Severity:  normal         |   Keywords:
  Focuses:  ui             |
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 This is also reported in the Alpha/Beta Forum and I could reproduce it on
 my localhost:

 - Went to Customize > Header Media > Header Image + Add new image
 - Uploaded a 2,5 MB image with 3840x2160 px
 - Cropped the image (no adjustment of the suggested frame)
 - The file that is than used as header image is 768x461 px (37 kB) and
 stretched. Slightly blurry.

 But the image is availabe with 2000x1200 px in the upload folder.
 When I use this from the media library as featured image for a post, the
 bigger 2000x1220 px picture (170kb) is used there, and not the smaller
 one, like the header does.

 Going to the Customizer and choosing another already uploaded image as
 header image with 2000x1200 px and not cropping it, does also use the
 768x461 px file variant as header image.

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Ticket URL: <https://core.trac.wordpress.org/ticket/38847>
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