Why does Hugin slightly change color and exposure in part of a panorama?
Asked 4/13/2020
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I'm stitching three RAW images into a countryside panorama with Hugin. All three source images were shot with the same camera settings and processed identically in RawTherapee, with an embedded RTv4_sRGB profile. However, in the stitched panorama, the right side shows a noticeable shift in color and a small exposure change compared with the corresponding source image. In Hugin, the output option used was "Exposure corrected, low dynamic range." What could cause this kind of localized color/exposure shift during stitching?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
6y ago
2 Answers
1
I don't see a strong colour shift, I see a slight colour shift and an equally slight exposure shift.
I think it could be due to the vignetting removal of Hugin?
(If you really see a strong shift in colour, we have a difference in our displays. When I get home I can try to compare with better displays.)
Originally by user63032. Source · Licensed CC BY-SA 4.0
user63032
6y ago
0
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A small shift like this can happen during Hugin’s blending and exposure-correction stage rather than coming from your RAW conversion. Based on the reported result, the change looks slight, not drastic, and the matching exposure change suggests Hugin is adjusting tone while stitching.
One likely cause is Hugin’s vignetting or exposure compensation during blending. Even if the source files were processed identically, panorama software may still try to even out brightness across overlapping frames, and that can slightly alter color appearance as well.
So the most likely explanation is not a bad color profile in the source images, but Hugin’s correction/blending choices in the final render. Check any vignetting, exposure, or photometric correction settings and, if possible, compare output with those adjustments reduced or disabled.
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