[Digikam-devel] [Bug 148540] Plugin for adding noise to images

Dik Takken d.h.j.takken at phys.uu.nl
Tue Aug 14 21:06:01 BST 2007


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http://bugs.kde.org/show_bug.cgi?id=148540         




------- Additional Comments From d.h.j.takken phys uu nl  2007-08-14 22:05 -------
I tried that, but the film grain plugin does something completely different than the HSV scatter tool found in GIMP. The HSV scatter tool does something like this, for every pixel:

Pixel.Lightness += LightnessAmplitude * Rand()
Pixel.Hue += HueAmplitude * Rand()
Pixel.Saturation += SaturationAmplitude * Rand()

And this is exactly what I need. I tried adding pseudo detail using the film grain tool, but I bumped into two problems:

* The 'grains' are too large. As a result, the image looks 'dirty' rather than detailed.
* It does not only add texture, but it also changes brightness/contrast.



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