Contrast/Gamma settings for DigiKam?

[Paristo]

KDE has good color correction settings on monitor settings (right click on
desktop and screen/monitor > second tab) but normal user dont usually know
this if they just corrects lighting from own pictures.

That's why i like suggest that Digikam should get same kind "color card". It
should tell user basics how to set monitor settings right for viewing/editing
purpose from KDesktop and from monitor (contrast/brightness etc).

I came up with this when did my friend buy new LCD monitor and throw away her
old CRT and all her gamma/brightness settings was so hi that screen was white
with new LCD and he needed to change everything back to normal. Then he asked
me how should he set the screen and i gave him a "gray-card" (picture from
web, like KDesktop has). Then he realized that almost all her pictures (just
few dozen) was edited on too dark monitor and laughed that now he knows why i
asked from him "why you set these pictures so bright?".

And even new LCD monitors has nice "little" auto-corrections, user still needs
change screen brightness and contrast.

Second suggestion is that digikam can show luminosity/red/green/blue/alpha
over picture but it shows all colors as own and there is no option to see all
colors together as in Picasa. So is there possible way to add this option?
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Risto Saukonpää wrote:
> KDE has good color correction settings on monitor settings (right click on
> desktop and screen/monitor > second tab) but normal user dont usually know
> this if they just corrects lighting from own pictures.
>
> That's why i like suggest that Digikam should get same kind "color card". It
> should tell user basics how to set monitor settings right for viewing/editing
> purpose from KDesktop and from monitor (contrast/brightness etc).
>

This is really important topic in working with digital photographs. With an
incorrectly set screen, one can destroy the picture, since he might think that
the picture is too dark, however the screen is the dark, not the picture.
About this topic, I have found a _very_ good site, with a very good gamma
calibration picture.
This is it:
http://www.normankoren.com/Gamma_black_new.png

The description about the correct settings can be found at:
http://www.normankoren.com/makingfineprints1A.html

Maybe it would be possible to build in this picture to digikam...with the
permission of the author, of course.

Best regards,
Gabor
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Dudas Gabor wrote:

> The description about the correct settings can be found at:
> http://www.normankoren.com/makingfineprints1A.html

be aware that this don't works on all the systems. I tryed
it extensively with no good result.

I think the notion of "gamma" is not the same for all the
users/programmers. If I use the settings given in this page,
I get a much to brilliant screen, with no more rapport with
the reality of professional prints.

now I use only the gray scale avaiable on many sites (and
visible on the reference at the top of an image)

tools: xgamma and monica

in fact I thing that the surrounding of the monitor have a
great importance in the seen result. The "standard" settings
are probably done for a bright sunny room, when mine is
quite always dark, with a very dark screen, just a small
light on the screen back.

and I feel like seeing very easily that the print picture is
just a little lighter that my screen, so I adjust my images
to be just a little too black on my screen :-)

http://dodin.org/galerie_photo_web/expo/index.html

and I use to do 60cm large prints and perfectly satisfied of
the result (tested from several suppliers).

jdd

--
http://www.dodin.net
http://dodin.org/galerie_photo_web/expo/index.html
http://lucien.dodin.net
http://fr.susewiki.org/index.php?title=Gérer_ses_photos
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jdd wrote:

> Dudas Gabor wrote:
>
>> The description about the correct settings can be found at:
>> http://www.normankoren.com/makingfineprints1A.html
>
> be aware that this don't works on all the systems. I tryed
> it extensively with no good result.
>
> I think the notion of "gamma" is not the same for all the
> users/programmers. If I use the settings given in this page,
> I get a much to brilliant screen, with no more rapport with
> the reality of professional prints.

I would not say I understand you perfectly...
What is the relation of gamma value to softwares/programmers?
I have the strange feeling that you have tried to give 2.2 to xgamma.
You have to set your screen _final_ gamma to have 2.2.
This is defined by the sRGB, based on experience. It does not mean that you have
to set xgamma to 2.2!! Of course not. Every screen has a gamma value, because of
the electron beamer behavior. This is more or less a fixed number (around 2.5).
You have to modify this value to get the 2.2, which is good for the human eye to
distinguish the different shades. So you dont set the gamma value, but you set
the gamma-correction value, to obtain the correct gamma. (which is 2.2)
So if you make a simple division of 2.5 and 2.2, it gives 1.136. This is the
value that (ideally!!) you should use with xgamma. But ofcourse this doesn't
give always perfect result. Thats why you have to use that figure. Doesn't
matter if you are using windows, or Linux-xgamma, or whatever.
Please correct me, if I misunderstood you.

Anyway. To give more to read:

http://applications.linux.com/article.pl?sid=05/02/07/2244242&tid=47&tid=26&tid=7

Best regards,
Gabor
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