[Digikam-devel] [Bug 188573] RW2 converter broken for low light images

Matthias Welwarsky matze at welwarsky.de
Thu Apr 2 12:11:11 BST 2009


https://bugs.kde.org/show_bug.cgi?id=188573





--- Comment #16 from Matthias Welwarsky <matze welwarsky de>  2009-04-02 13:11:01 ---
(In reply to comment #15)
> Matthias,
> 
> for virtually all pictures you need some kind of image data auto-scaling for
> first preview. 99%-rule will fail on black image with only few bright pixels
> (star sky, eclipse), but works well for most images.

Alex, of course I acknowledge that you need some adjustment to auto-scale for a
first preview. It is just that the 99%-rule is not appropriate for a RAW
converter. You can do that to find a basic conversion curve in the Curves tool,
but it must always be reversible. So yes, I agree, something has to be done so
that the images don't look dull and underexposed, but the RAW converter is not
the right place for that. It's a solution to the problem, but it's not the
correct one.

There is a reason why photographers go through the (relative) pain of
developing RAW files for themselves. It is to create better pictures than from
using the in-camera JPEG engine. If the first conversion step is already lossy,
what's the  point then?

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