[Digikam-devel] [Bug 295523] Canon Powershot S100 RAW improperly treated

[Gilles Caulier]

https://bugs.kde.org/show_bug.cgi?id=295523

--- Comment #1 from Gilles Caulier <caulier.gilles at gmail.com> ---
Marie Noelle,

This is a typical case where JPEG is better than RAW, due to post processing
done by camera to render JPEG. Here you can see the comparison of Raw (on left
side) and JPEG (on right side):

http://www.flickr.com/photos/digikam/6964153119/sizes/o/in/photostream/

RAW is loaded in light table as half size preview. We don't use JPEG embedded.
JPEG is full size preview.

If we load RAW JPEG embedded, both image are the same.

Why ? It's simple : you camera, to process JPEG, it apply Lens distortion
corrections. You have used a short focal (as a fish eyes lens), and camera fix
image using lens profile. Probably that chromatic aberration correction are
processed. This is why the magenta-tinted area disappear in JPEG.

RAW file, is... raw image, unprocessed by camera.

It's not possible (or it's complex) to reproduce camera fixes with RAW. 

Alex can you confirm my analyse ?

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