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Bug #12033

Lighttable image quality reduced or broken after editing

Added by X X 4 months ago. Updated 4 months ago.

Status:
New
Priority:
Low
Assignee:
-
Category:
-
Target version:
-
Start date:
02/25/2018
Due date:
% Done:

0%

Affected Version:
2.4.1
System:
Windows
bitness:
64-bit
hardware architecture:
amd64/x86

Description

When performing any operation in the darkroom, the image will appear blurred in the lighttable. It should be displayed with higher quality. This is always the case.
Also sometimes the image will look completely broken. This is hard to reproduce, however.

History

#1 Updated by X X 4 months ago

Cropping seems to lead to broken lighttable images somewhat frequently.

#2 Updated by Tobias Ellinghaus 4 months ago

Next time it happens, please take a screenshot, so we know what exactly the problem looks like.

#3 Updated by X X 4 months ago

#4 Updated by Tobias Ellinghaus 4 months ago

Strange, that file works fine for me, both on Linux and Windows. There are two things I'd like you to try:

  1. resize the window
  2. check if OpenCL is enabled in the preferences and turn it off if it is enabled

Does any of the two help?

#5 Updated by X X 4 months ago

1. Resizing the window doesn't change anything.
2. OpenCL support is "not available". I guess this is either due to the Windows version or my relatively old graphics card, which does support OpenCL, but only version 1.1.

#6 Updated by X X 4 months ago

PS: Did you use the image in its original resolution? I think it happens more frequently with higher resolution images, but I'm not 100% certain.

#7 Updated by X X 4 months ago

Another observation: The broken images always seem to be most broken in the upper third part, as can be seen in the example image. Sometimes the rest of the image looks relatively normal, sometimes it's this very blurred grayscale result as in the example.

#8 Updated by X X 4 months ago

It also seems to occur mostly in the two most close-up zoom levels and look OK in the others. I will try to observe whether this is always the case.

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