Re: questions about the raw importer

Posted by Gilles Caulier-4 on Sep 02, 2008; 9:49pm
URL: http://digikam.185.s1.nabble.com/questions-about-the-raw-importer-tp1741494p1741495.html

2008/9/2 Gandalf Lechner <[hidden email]>

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

_______________________________________________
Digikam-users mailing list
[hidden email]
https://mail.kde.org/mailman/listinfo/digikam-users