On issue #9013, I was adviced to re-open it if I have updated presets
with the latest firmware of my camera. I have and made an update.
Unfortunately, I can't find a way to re-open that issue. Please help.
Cheers,
Richard
--
Richard Levitte rich...@levitte.org
http://richard.levitte.org/
"Life is a tremendous celebration - and I'm invited!"
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--- Begin Message ---
Issue #9013 has been updated by Pascal de Bruijn.
Status changed from New to Closed: upstream
Priority changed from Medium to Low
We get the white balance presets from the UFRaw project.
The white balance presets are occasionally changed by the vendors between
firmware revisions.
So make sure you have the latest camera firmware, and if it still differs
(assuming the white balance presets were based on an earlier firmware), you can
submit new white balance presets to the UFRaw project and us.
This script might be helpful (it's not very well maintained, so you might need
to ignore some warnings here and there 2>/dev/null and such):
http://ufraw.cvs.sourceforge.net/viewvc/ufraw/ufraw/wb_extract.pl?view=markup
Feel free to re-open this bug if you have updated presets using the latest
camera firmware (and report which firmware version you used).
----------------------------------------
Bug #9013: White balance module: presets for Canon 600D incorrect
http://www.darktable.org/redmine/issues/9013#change-21668
* Author: Richard Levitte
* Status: Closed: upstream
* Priority: Low
* Assignee:
* Category: Darkroom
* Target version:
* Affected Version: git development version
----------------------------------------
Hello,
I had a closer look at the presets used for my Canon 600D, and noticed that
when I would use the daylight preset with an image that was taken with my
camera set to daylight, the 'temperature in' slider would differ from the
'temperature out' slider. Not enormously, but still enough to matter.
This had me take a closer look at the presets (src/iop/wb_presets.c) for the
600D and compare it to the settings the camera will give me.
>From exif data:
WB RGGB Levels Daylight : 2289 1024 1024 1651
Color Temp Daylight : 5200
WB RGGB Levels Shade : 2655 1024 1024 1411
Color Temp Shade : 7000
WB RGGB Levels Cloudy : 2467 1024 1024 1522
Color Temp Cloudy : 6000
WB RGGB Levels Tungsten : 1636 1024 1024 2467
Color Temp Tungsten : 3200
WB RGGB Levels Fluorescent : 2005 1024 1024 2315
Color Temp Fluorescent : 3729
WB RGGB Levels Flash : 2570 1024 1024 1500
Color Temp Flash : 6320
Calculating these to floats with green being 1.0 (divide all numbers with
1024), it gives us this:
Daylight: 2.2353516 1.0 1.6123047
Shade: 2.5927734 1.0 1.3779297
Cloudy: 2.4091797 1.0 1.4863281
Tungsten: 1.5976563 1.0 2.4091797
Fluorescent: 1.9580078 1.0 2.2607422
Flash: 2.5097656 1.0 1.4648438
Looking at wb_presets.c, I find this:
{ "Canon", "EOS 600D", Daylight, 0, {
2.1602, 1, 1.5752, 0 } },
{ "Canon", "EOS 600D", Shade, 0, { 2.5098, 1,
1.3418, 0 } },
{ "Canon", "EOS 600D", Cloudy, 0, { 2.3330, 1,
1.4502, 0 } },
{ "Canon", "EOS 600D", Tungsten, 0, {
1.5371, 1, 2.3594, 0 } },
{ "Canon", "EOS 600D", WhiteFluorescent, 0, {
1.8789, 1, 2.2402, 0 } },
{ "Canon", "EOS 600D", Flash, 0, { 2.4268, 1,
1.4297, 0 } },
As you can see, there's quite a difference.
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