[wp-trac] [WordPress Trac] #17626: image_get_intermediate_size() may return wrong thumbnail size

[WordPress Trac]

#17626: image_get_intermediate_size() may return wrong thumbnail size
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 Reporter:  chipbennett   |       Owner:  markoheijnen
     Type:  defect (bug)  |      Status:  assigned
 Priority:  normal        |   Milestone:  Future Release
Component:  Media         |     Version:
 Severity:  normal        |  Resolution:
 Keywords:  has-patch     |     Focuses:
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Comment (by Krstarica):

 Hi Joe,

 When one of the image dimensions is 0, WP resizes image proportionally
 using non-zero dimension. This is the only way to generate correct
 thumbnail without using crop.

 E.g.

 - if we specify array(300,0) as a new size, the image with dimensions
 600x400 should be scaled to 300x200.

 - if we specify array(0,100), the image with dimensions 450x300 should be
 scaled to 150x100.

 Sometimes this was working properly and sometimes it was picking the
 incorrect dimension. Lately I've found some images not having the
 specified dimension even with my 'patch', e.g. instead of array(300,0) it
 picks array(640,0).

 Warm regards,
 Ivan

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Ticket URL: <https://core.trac.wordpress.org/ticket/17626#comment:32>
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