[Digikam-devel] [Bug 127577] raw display too dark and not rotated

[Peter Heckert]

Gilles Caulier schrieb:
> with 0.9.0, dcraw extract image data in linear mode to unlost image color data depth. To have the right exposure, you need to use ICC color profile management !!!
>
> With my Minolta Dynax5D, i use icc color profiles provides with my camera (*.icc). I set the right icc color profile in ICC setup, and that all 
> A screenshot : http://digikam3rdparty.free.fr/Screenshots/iccworkflowwithrawimages.png
>
> http://digikam3rdparty.free.fr/ICCPROFILES/
>
> ALL contributions welcome about this repository ! If you have anothers icc file to place in this area, let's me hear !
>   
Hello Gilles,

I have found, that the minolta D5D colorspaces gives too much saturation
for blue and cyan.

I dont know exactly, but I mean, that the minolta colorspaces are  for use
in Minoltas raw-converter.
They do also have proprietary tables that are only understood by Dimage
master and some other raw converters and not by generic colormanagement
tools. I believe that dcRAW does similar corrections.

My experience comes from using dcraw (in Windows) and from UFRAW.
(Will check later how it looks in digikam)

So I made my own colorspace:
<http://home.arcor.de/peter.heckert/raw/RawSharpen/sRGBG1.icc>

This has the same primary colors as sRGB but uses Gamma=1.0 (not Gamma=2.2)

With this colorspace the colors are almost the same as in the camera 
supplied JPG.
(Camera WB must be used)
(Contrast and saturation should be increased, but I think, this is ok 
for a raw image,
because the camera firmware will do this also  when it produces the jpeg.)

The colorspace is homemade and copyright free and could be used as generic
input colorspace, because most sensors have a native physical gamut 
similar to sRGB.
This fact doesnt hinder the camera to produce Adobe RGB images, and is 
invisible
at the monitor, because Monitors cannot reproduce the full AdobeRGB Gamut,
but the image can benefit in this case from finer color gradadation though.

I have also tried to use the AdobeRGB primary colors with Gamma=1 but this
did not give this results.

greetings,

Peter