Public bug reported:
Steps to Reproduce:
1. Download and unzip http://www.knowingme.org/darktable-contrast-bug.zip (this
archive only contains image files)
2. Import IMG_3082.CR2 into Darktable 1.4, using the "image" option in "import"
module in left sidebar in Darktable's Lighttable
3. Export to JPG using the "Export Selected" module in right sidebar in
Darktable's Lighttable
4. Export to 16-bit PNG using the "Export Selected" module in right sidebar in
Darktable's Lighttable
5. Compare both exports (JPG and PNG) in EoG. Notice: PNG displays correctly,
JPG has colours and contrast washed-out.
6. Open PNG in Gimp
7. Export as JPG
8. Open Gimp-converted JPG and straight-from-Darktable JPG in EoG
9. Compare back to back. Notice: straight-from-Darktable JPG is washed-out, but
JPG converted from PNG displays correctly.
10. Open both JPGs in Gimp, compare back to back. Notice: both display
identically.
Actual Result:
When exporting an image from Darktable as JPG, EoG displays the image with
washed-out contrast, brightening the dark parts and revealing compression
artifacts. It seems colour vibrance gets lost as well. The package referenced
in step 1 above contains Darktable-JPG.jpg, which can be used for easy
comparison in various programs, e.g. EoG vs. Chrome, Firefox, Gimp, GThumb.
Expected Result:
EoG should display JPGs exported from Darktable with correct colours.
Notes:
1. Darktable-JPG.jpg was exported straight from Darktable. Open in EoG vs. any
other viewer and compare.
2. When exporting from Darktable to PNG, the PNG displays properly in EoG.
3. When converting that PNG to JPG with e.g. Gimp or Phatch, the resulting JPG
will display properly in EoG (repro steps 6-10). Reference:
Darktable-PNG-Gimp-JPG.jpg was created following repro steps 6-10 and can be
used for easy comparison. Open in EoG vs. any other viewer and compare.
4. It seems Darktable writes JPGs in a way that EoG is not compatible with. No
other image processing programs seem to write JPGs the same way as Darktable,
nor do any other viewers seem to mind Darktable's JPGs.
5. This may seem like a very specific use case at first glance, but it does
mean that any photographers using Darktable (which is among the most popular
raw processing suites for Linux) will move away from EoG to view their JPGs.
6. Ubuntu 13.10, 64 bit. EoG 3.8.2.
** Affects: eog (Ubuntu)
Importance: Undecided
Status: New
** Tags: contrast darktable eog eye gnome jpg of
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https://bugs.launchpad.net/bugs/1265224
Title:
EoG: Washed-Out Colour Contrast when Viewing JPG exported from
Darktable
Status in “eog” package in Ubuntu:
New
Bug description:
Steps to Reproduce:
1. Download and unzip http://www.knowingme.org/darktable-contrast-bug.zip
(this archive only contains image files)
2. Import IMG_3082.CR2 into Darktable 1.4, using the "image" option in
"import" module in left sidebar in Darktable's Lighttable
3. Export to JPG using the "Export Selected" module in right sidebar in
Darktable's Lighttable
4. Export to 16-bit PNG using the "Export Selected" module in right sidebar
in Darktable's Lighttable
5. Compare both exports (JPG and PNG) in EoG. Notice: PNG displays correctly,
JPG has colours and contrast washed-out.
6. Open PNG in Gimp
7. Export as JPG
8. Open Gimp-converted JPG and straight-from-Darktable JPG in EoG
9. Compare back to back. Notice: straight-from-Darktable JPG is washed-out,
but JPG converted from PNG displays correctly.
10. Open both JPGs in Gimp, compare back to back. Notice: both display
identically.
Actual Result:
When exporting an image from Darktable as JPG, EoG displays the image with
washed-out contrast, brightening the dark parts and revealing compression
artifacts. It seems colour vibrance gets lost as well. The package referenced
in step 1 above contains Darktable-JPG.jpg, which can be used for easy
comparison in various programs, e.g. EoG vs. Chrome, Firefox, Gimp, GThumb.
Expected Result:
EoG should display JPGs exported from Darktable with correct colours.
Notes:
1. Darktable-JPG.jpg was exported straight from Darktable. Open in EoG vs.
any other viewer and compare.
2. When exporting from Darktable to PNG, the PNG displays properly in EoG.
3. When converting that PNG to JPG with e.g. Gimp or Phatch, the resulting
JPG will display properly in EoG (repro steps 6-10). Reference:
Darktable-PNG-Gimp-JPG.jpg was created following repro steps 6-10 and can be
used for easy comparison. Open in EoG vs. any other viewer and compare.
4. It seems Darktable writes JPGs in a way that EoG is not compatible with.
No other image processing programs seem to write JPGs the same way as
Darktable, nor do any other viewers seem to mind Darktable's JPGs.
5. This may seem like a very specific use case at first glance, but it does
mean that any photographers using Darktable (which is among the most popular
raw processing suites for Linux) will move away from EoG to view their JPGs.
6. Ubuntu 13.10, 64 bit. EoG 3.8.2.
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