[Digikam-devel] Experimental: under and over exposure indicator on Image Editor...

[Gilles Caulier-2]

Hi all,

Since a long time i have the idea to implement a pixels exposure indicator to
show over-exposed and under-exposed areas on picture.

With digital camera, an under-exposed image give pixels with a pure black. To
oposite, an over-exposed image give pixels with a pure white.

From my Minolta Dynax 5D, when i preview a picture on the side pannel, there
is a tool witch display the histogram and blink the over exposed pixels using
black color and the under exposed using white color.

Look on this review, at "Play Display" section. There is example of the panel
in action :

http://www.dpreview.com/reviews/konicaminolta7d/page7.asp

I have tried to reproduce this feature in editor. The blinking way is not
possible to do, but build and show a mask to overcolor the pixels is easy :

http://digikam3rdparty.free.fr/Screenshots/underexposureindicator.png
http://digikam3rdparty.free.fr/Screenshots/overexposureindicator.png

If you want to try it, there is a patch against svn here :

http://digikam3rdparty.free.fr/misc.tarballs/exposureindicator.patch

Let's me hear if you like these features...

Gilles
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Dnia sob sty 13 2007, Caulier Gilles napisał:
>
> Let's me hear if you like these features...

Feature itself is fine. But there is already similar function in one of
digikamimageplugins?

In that plugin you can already do something about this problem. Only
showing problems in main window doesn't help much. Maybe clicking icon
in lower-right corner could bring that plugin (if available)?

m.

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[Gilles Caulier-2]

Le Samedi 13 Janvier 2007 22:05, Mikolaj Machowski a écrit :
> Dnia sob sty 13 2007, Caulier Gilles napisał:
> > Let's me hear if you like these features...
>
> Feature itself is fine. But there is already similar function in one of
> digikamimageplugins?

well, yes, only to give the over exposure to all color correction tools...
but, it's hard coded in all correction algorithm, and for some one, it don't
work properly (look the result of White Balance tool for example).

i will give a common method for all plugins to give a report of over and under
exposure correction.

>
> In that plugin you can already do something about this problem. Only
> showing problems in main window doesn't help much. Maybe clicking icon
> in lower-right corner could bring that plugin (if available)?
>

no. given these indicator in Image Editor will give a feedback to see if the
pictures have been properlly exposed by the camera, for example to check the
right picture to choose in a group of similar images.

Of course, the histogram can help you for this task, but don't give the
information about the place where are the wrong exposed pixels.

Gilles
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