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Bug #12283

PPG OpenCL results in overt desaturation and loss of contrast

Added by R - 10 days ago. Updated 10 days ago.

Status:
New
Priority:
Low
Assignee:
-
Category:
OpenCL
Target version:
-
Start date:
08/06/2018
Due date:
% Done:

0%

Affected Version:
git master branch
System:
other GNU/Linux
bitness:
64-bit
hardware architecture:
amd64/x86

Description

Darktable master (built Aug 5, 2018)
OpenCL enabled via Intel NEO compute-runtime (Intel HD 520 GPU)
Archlinux up-to-date Aug 5, 2018

When OpenCL is enabled, all photos demosaiced with PPG results in a very flat, desaturated image. Switching to any other algorithm produces the expected result.
Disabling OpenCL, PPG produces a result that matches other algorithms with correct saturation.

20180727_042923-1.jpg - PPG with OpenCL (170 KB) R -, 08/06/2018 06:55 AM

20180727_042923-1_01.jpg - PPG without OpenCL (181 KB) R -, 08/06/2018 06:55 AM

History

#1 Updated by R - 10 days ago

It looks like it's just a saturation issue.

#2 Updated by Roman Lebedev 10 days ago

R - wrote:

Darktable master (built Aug 5, 2018)
OpenCL enabled via Intel NEO compute-runtime (Intel HD 520 GPU)
Archlinux up-to-date Aug 5, 2018

When OpenCL is enabled, all photos demosaiced with PPG results in a very flat, desaturated image. Switching to any other algorithm produces the expected result.
Disabling OpenCL, PPG produces a result that matches other algorithms with correct saturation.

It is very likely to be again a driver issue. pocl and beignet are broken (unless something changed).
Your observation suggests that new driver is broken, too.

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