About overexposure reconstruction

[Leonardo Giordani-2]

Hi all,

I'm working with the SVN of yesterday (31 Aug) and noticed a strange behaviour of the overexposure reconstruction while importing RAW data (Canon CR2 from EOS 350D).
I'm do not know if what I'll describe is an error or the right behaviour of the tool.

I refer to the 3 screenshots you can find on http://picasaweb.google.it/giordani.leonardo/DigiKamReconstruction#
Sorry for the localized italian interface.

1. This is a RAW image loaded with Exposure Reconstruction set to Full White
2. This is the same image with Exposure Reconstruction set to Reconstruct (level 0)
3. This is the same image with Exposure Reconstruction set to Reconstruct (level 3) - This is exactly the same as 2

I do not understand why the reconstruction of overexposed zones should compress the histogram as shown. Is this an error?

Thank you in advance

Leonardo



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

On Tuesday 01 September 2009 11:59:51 Leonardo Giordani wrote:
> (level 3) - This is exactly the same as 2
>
> I do not understand why the reconstruction of overexposed zones should
> compress the histogram as shown. Is this an error?
>

If whole image don't be darkened reconstructed areas would look artificial.

Just increase EV after reconstruction. To minimize banding you should keep 16-
bit workflow.

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