Photoshop renders some JPEG files differently from other applications

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  • Problem
  • Updated 5 years ago
  • (Edited)
Note: For detailed explanation please see this post: http://forums.adobe.com/message/53489...

Photoshop reduces the quality of certain JPG files when opening them.
Comparison screenshot: http://i.imgur.com/lDOYRjo.jpg
(left side: image viewers, PaintShop Pro etc.; right side: Photoshop CS6 and CS4)

If you look closely at the borders of the color areas, the right side has visible distortion/artifacts added to it.

Image source: http://farm5.staticflickr.com/4153/49...
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M4he

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Posted 5 years ago

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Chris Cox

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This looks like the image had chroma subsampling, and the different JPEG implementations handle the upsampling slightly differently.

Despite JPEG being a "standard", there are a number of things that are not explicit in the standard and open to interpretation by each implementation - and this is one of those areas.
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M4he

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Dear Chris,

thanks for your reply!

1. So I guess there's nothing I can do on my end to avoid this, right?
2. The metadata of the image says it was saved/edited with Adobe Lightroom. How come Adobe applications handle JPEG differently?
3. Photoshop seems to be the only one having this sort of implementation. JPEGView, Google Chrome, PaintShop Pro X5 and MS Paint all opened the image correctly...