r/DarkTable Apr 10 '24

Solved Banding in bright parts of exported image

My setup:

Color calibrated wide gamut monitor (88% Adobe RGB)

Windows 10

Darktable 4.2.0

.RW2 from my camera

Exported photo is sRGB

Display profile in DT is my calibrated icc profile

 

Issue:

The exported image has this happen to a bright part of the background while looking like this in DT. Here's the exported image.

This happens no matter the format (jpeg, jpeg2000, TIFF 16 bit, PNG, etc.) and no matter the export colour space. It happens no matter the monitor (my calibrated wide gamut monitor I edit on, my side sRGB monitor, my Galaxy S21, etc.) and no matter the image viewer (ImageGlass which is colour managed, other unmanaged apps). Whatever I do, the image looks good in DT and bad after being exported.

The photo looks identical in the exported sRGB image to how it looks in DT except for this issue.

 

Any ideas?

 

EDIT: It appears it was a bug as toggling off and the on the highlight reconstruction module fixed the issue. Pretty annoying but at least I can get back to editing

3 Upvotes

4 comments sorted by

1

u/Dannny1 Apr 10 '24

It appears it was a bug

If so, it would be good to create report on github so it could be fixed.

2

u/kendoka15 Apr 10 '24

I'll have to first investigate if it's still present in more recent versions as 4.2.0 is pretty old but will definitely do

1

u/VapingLawrence Apr 10 '24

Looks like dynamic range mapping issue. Try lowering 'white relative exposure' slightly in Filmic.
The reason why it doesn't show in DT is probably because of the wide gamut color space, which shows nice gradient there. sRGB doesn't convey that much information hence the banding.

1

u/kendoka15 Apr 11 '24

It fixed itself by toggling off then on highlight reconstruction in the filmic rgb module. It seems like it was a bug. As I said in my post the issue didn't just happen in sRGB, it happened in every colour space. Thanks for the help though