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M4he
Currently Being Moderated

Distortion added when opening certain JPG files, why?

May 24, 2013 2:24 AM

Tags: #cs4 #distortion #cs6 #jpg #quality_loss

When opening certain JPG images in Photoshop, they look different (worse) than when opened in any other application. They get some kind of additional distortion/artifacts.

 

If you look closely at the right side of the following screenshot, you will notice that the edges between the color areas are kinda jagged (less smooth) in comparison to the left one.

When zooming in, it appears that every second pixel line at the borders of the red areas is distorted in horizontal direction:

http://i.imgur.com/lDOYRjo.jpg

left side: image opened with JPEGView, Windows Photo Viewer, Google Chrome or PaintShop Pro X5

right side: image opened with Photoshop CS6 (also tested on an old CS4 version - same result)

 

The image retains those distortions when saved from Photoshop. No matter if saved lossless (PNG) or not (JPG).

However, when opening the image with an image viewer (i.e. JPEGView), taking a screenshot and pasting it into Photoshop, there are no such artifacts. Even when then saved as JPG and reopened, there is still no distortion.

 

Therefore the issue must be related to the format the original files are saved in. According to the metadata stored within the JPG the image was edited with "Adobe Lightroom".

 

You can find the image in question here: http://farm5.staticflickr.com/4153/4998481702_82cd4a77be_o.jpg

(it happens to other related images from this photostream too)

 

Can anyone shed light on what's happening here?

 
Replies
  • Currently Being Moderated
    May 24, 2013 2:48 AM   in reply to M4he

    Could eitehr be PS's cache tiling doing something weird or a hardware acceleration issue. As a test, turn off OpenGL/ OpenCL under Edit --> Preferences --> Performance and see, if it makes a difference. Also check your cache settings.

     

    Mylenium

     
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  • Currently Being Moderated
    May 24, 2013 3:29 AM   in reply to M4he

    Does the file use a specific color profile/ your system use a color profile? Sometimes this may lead to odd display artifacts when there's a conflict between different profiles.

     

    Mylenium

     
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  • Currently Being Moderated
    May 24, 2013 4:39 AM   in reply to M4he

    Mmh, okay. Just guessing around, really. The only remaining item I can think of is something with your screen DPI setting being different inside PS vs. the rest of your system...

     

    Mylenium

     
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