[wp-trac] [WordPress Trac] #26848: Image thumbnail on large images with ratio of 4:1

[WordPress Trac]

#26848: Image thumbnail on large images with ratio of 4:1
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 Reporter:  nathan_dawson  |      Owner:
     Type:  defect (bug)   |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  Media          |    Version:  3.8
 Severity:  minor          |   Keywords:
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 I have been running into this issue on WordPress 3.7.1 and 3.8. I haven't
 tested it in older versions.

 I'm uploading an image that's 2000px x 500px.

 The theme uses add_image_size for a variety of different thumbnail sizes
 but the only one that's an issue is 480px.

 The URL to the thumbnail is being retrieved with
 wp_get_attachment_image_src( $thumbnail_id, 'mobile' ) for use with some
 CSS. Chrome is recognising it as a 1px x 1px image with a MIME type of
 image/png. When you open the image URL it appears correctly.

 '''Steps to reproduce:'''

 add_image_size( 'mobile', 480, 0, true ); in functions.php
 Upload a blank image at 2000px x 500px

 I also found in Chrome that when going to my uploads folder and selecting
 the image that's 480px x 120px I can't save the image with CMD SHIFT S yet
 I can with any of the other images.

 I have tried removing all plugins and using the default theme. The only
 modification I made was to add the image size.

 I changed the image library from libgd to imagemagick.

 Changing the image size from 480px to 479px works.

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Ticket URL: <https://core.trac.wordpress.org/ticket/26848>
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