[Digikam-users] questions about the raw importer

[Gilles Caulier]

2008/9/2 Gandalf Lechner <gandalf.lechner at univie.ac.at>

> Hi all,
>
> today I spent some time with digikam's new raw importer in 0.9.5svn and can
> confirm once again that it has improved a lot over the previous versions.
> Nontheless, I would like to ask some unrelated questions about it.
>
>
> 1) white balance.
> Do the settings "default D65", "camera", "automatic" just correspond to
> fixing
> some value of the temperature?


Use SHIFT F1 over the settings to have explainations.


> Or are there some more internal settings
> involved? If it's only the temperature (and green tint, maybe), it would be
> helpful if the chosen temperature would be indicated on the slider, with
> dragging the slider changing whitebalance to manual mode.


i like the idea.


> 2) black and white.
> I don't understand these settings very well, but that's probably due to my
> limited photography knowledge ;-) My guess is that with these sliders, you
> can
> cut off the spectrum at the left or right hand side. Is that correct?


yes. it's the black point and white point.


> If yes,
> it would be great if this cut off could be visualized in the spectrum
> depicted
> in the importer. Or how can I see what value is appropriate?


this is that i would to do but with dcraw it's impossible. The histogram to
cut is an internal one used during the demosaiced process.

i will trying to see if libraw will be better for that


>
>
> 3) luminosity curve.
> For consistency with the rest of digikam, maybe for "reset to linear" the
> same
> button as for all the other reset buttons could be used. The micro button
> which is used right now can actually easily be overlooked.


planed.


>
>
> 4) workflow for imported images.
> After the raw image is imported, usually some more adjustments like crop,
> sharpen, etc are made. What is the intended workflow here?
> I started out with importing the raw image, save it to something non-raw,
> and
> then do further adjustments. Or can the tools in the image editor work
> directly on the raw data?


no. editor use a demosaiced image converted to RGB color space.



> Well, when I save the imported X.raw to, say, X.jpg
> and then do some more changes, I have the problem that saving after these
> changes does not work - digikam refuses to overwrite X.jpg with the changed
> X.jpg, and I am forced to pick a new file name. So I usually import, save
> to
> jpg, close the image editor, open the jpg again and then do the other
> adjustments.


I don't recommend to use JPG in your workflow. Use PNG instead.

your problem to overwrite an existing image is new for me. Somebody can
reproduce it ?

best

Gilles  Caulier
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.kde.org/pipermail/digikam-users/attachments/20080902/b220e422/attachment.html>