[Digikam-devel] [Bug 125387] Simulate changes to images only

[Julien Narboux]

https://bugs.kde.org/show_bug.cgi?id=125387


Julien Narboux <Julien at narboux.fr> changed:

           What    |Removed                     |Added
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                 CC|                            |Julien at narboux.fr




--- Comment #34 from Julien Narboux <Julien narboux fr>  2009-10-17 12:54:01 ---
To implement this feature one could use the GEGL library (http://gegl.org/).

In fact it implements a generalization of the idea of action lists by action
graphs. The graphs can be saved as xml (http://gegl.org/gallery/index.html).
The Digikam editor could be a QT gui for Gegl graph editing.
Nodes in the graph can be file opening, saving, applying effects to one picture
(contrast, lightness...) ,  applying effects to several picture (merging
layers...).

Using this library would have the following advantages:
- it is already implemented
- it is used by Gimp, so we can I hope it is well maintained
- it can deal with 32 bits floating point pictures so it could be used to
represent HDR pictures as well.

But porting the whole DigiKam editor to GEGL would be huge work.

If we look at GEGL 0.1.0 it already supports the following effects :
curve, levels, channels, brightness contrast gamma, hue saturation lightness,
stretch contrast, white balance, invert, basic bw conversion, unsharp mask,
simple local contrast, gaussian blur, resize, crop, rotation, text

But it is missing : 
CIMG based : noise reduction, inpainting, restoration ... 
lens correction, Digikam filters menu...

My 2 cents,

Julien

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