[Digikam-devel] [Bug 195050] Color management doesn't work in thumbnails and view mode

[Matti Rintala]

https://bugs.kde.org/show_bug.cgi?id=195050





--- Comment #39 from Matti Rintala <bitti cs tut fi>  2009-09-08 17:14:22 ---
Marcel,

I have been thinking about your comment about Nikon NEF files, colour profiles
and exif data. First, it's true that the embedded ICC profile in NEF files
edited with NX2 is the profile of the embedded full-res jpeg.

This is because in reality, Nikon NEF files are not just "raw sensor data
files". To my understanding, Nikon NEF file can contain a source image,
transformations applied to it, and then the resulting image (the embedded
full-res jpeg). With NEF files straight from camera, source image is the raw
sensor data, transformations consist of camera settings in the exif. When a raw
image is edited in NX2, additional edit steps are added to the metadata and the
embedded jpeg represents the final edited image.

It is even possible to edit a jpeg in Capture NX2 and store the result as a NEF
file! Then the source image is the original jpeg (stored inside the NEF file),
and file metadata contains all edit steps performed. The embedded jpeg
"preview" is the final edited jpeg.

And since you can choose the working colour space freely in NX2 (and change the
colour space as an edit step), the ICC profile in the NEF file is that of the
final image, i.e. the embedded jpeg.

For this reason the embedded jpeg is so important for Nikon NEF shooters
(especially us using Nikon software to edit it).

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