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Bug #12491

Low quality export file

Added by Mathieu Capronnier 7 months ago. Updated 7 months ago.

Status:
New
Priority:
Low
Assignee:
-
Category:
-
Target version:
-
Start date:
12/21/2018
Due date:
% Done:

0%

Affected Version:
2.4.4
System:
Windows
bitness:
64-bit
hardware architecture:
amd64/x86

Description

When exporting to JPEG, I have noticed that I get a significant drop in image quality when exporting to the max size (leaving 0x0). The result is much better when I use 1080x1920 (for example) as the max size. As you can see in the image, there is much more stars in the lower quality image. The result with the lower size image is much more closer to what I can see in the DT viewer.
I have taken my photos with a OnePlus 3T and edited the dng files on Darktable 2.4.4 on Windows 10.

1080x1920.jpg - 1080x1920 export (1.76 MB) Mathieu Capronnier, 12/21/2018 11:19 PM

IMG_20181104_231536.dng.xmp (17 KB) Mathieu Capronnier, 12/21/2018 11:19 PM

IMG_20181104_231536.dng - Original DNG (31.1 MB) Mathieu Capronnier, 12/21/2018 11:19 PM

IMG_20181104_231536.jpg.xmp (1.07 KB) Mathieu Capronnier, 12/21/2018 11:19 PM

IMG_20181104_231536.jpg - Original JPG (6.49 MB) Mathieu Capronnier, 12/21/2018 11:19 PM

No max size.jpg - No max size export (6.59 MB) Mathieu Capronnier, 12/21/2018 11:20 PM

History

#1 Updated by Aurélien PIERRE 7 months ago

Could you try to change the interpolation algorithm and see if the results are the same ?

Also, compare the export image and the darkroom preview at 100 % zoom ?

Some algorithms in dt are scale-dependent, so that could explain the variations.

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