[Kde-imaging] [Bug 262403] Adding Support for Aptina Camera Sensors raw image file format

[Alex Tutubalin]

https://bugs.kde.org/show_bug.cgi?id=262403





--- Comment #9 from Alex Tutubalin <lexa lexa ru>  2011-01-07 16:22:30 ---
AFAIK, digiKam cannot write DNG files.

Anyway, digiKam is *photo* processing application. For photo processing no one
want to look into RAW data: in linear space (so, very dark), without white
balance (so, with strong green cast for most cameras), without color profile
applied (so, with wrong colors). There is no way to show the photo right
without white balance and color profile data.

Answers to questions:
 black level is 'dark current' value. This value should be subtracted from RAW
data to get linearized data. Different cameras are very different in this
aspect.
 White level is saturation point (maximum possible value). It is critical to
know exact white level to get proper color in highlights.
 White balance/color temperature may be presented as color conversion matrix
(bradford conversion or so) or as per-channel multipliers (different for each
shot). LibRaw uses multipliers and try to get these values from camera
metadata.
 Color data (color matrix or color profile) is generalized description of
sensor's R/G/B filters.

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