[Bug 148540] New: Plugin for adding noise to images

[Dik Takken]

------- You are receiving this mail because: -------
You are the assignee for the bug, or are watching the assignee.
         
http://bugs.kde.org/show_bug.cgi?id=148540         
           Summary: Plugin for adding noise to images
           Product: digikamimageplugins
           Version: unspecified
          Platform: unspecified
        OS/Version: Linux
            Status: NEW
          Severity: wishlist
          Priority: NOR
         Component: Wish for new plugin
        AssignedTo: digikam-devel kde org
        ReportedBy: d.h.j.takken phys uu nl


Version:           0.9.2 (using KDE KDE 3.5.5)
OS:                Linux

Adding a very, very subtle layer of noise to an image often works well for improving the apparent quality of the image. Noise can add pseudo-detail, which make the image appear more detailed than it really is. Noise can also hide imperfections, like filter artifacts.

I often use GIMP to add 'HSV Scatter' noise after noise reduction, after applying the 'image restoration' plugin, and after enlargement (scaling). The 'Hue' and 'Saturation' settings are always reduced to zero in order to produce a type of noise that is barely visible.
_______________________________________________
Digikam-devel mailing list
[hidden email]
https://mail.kde.org/mailman/listinfo/digikam-devel

[Gilles Caulier-4]

------- You are receiving this mail because: -------
You are the assignee for the bug, or are watching the assignee.
         
http://bugs.kde.org/show_bug.cgi?id=148540         
caulier.gilles gmail com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID



------- Additional Comments From caulier.gilles gmail com  2007-08-14 09:19 -------
plugin lready exist : try FilmGrain tool

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

[Dik Takken]

------- You are receiving this mail because: -------
You are the assignee for the bug, or are watching the assignee.
         
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.
_______________________________________________
Digikam-devel mailing list
[hidden email]
https://mail.kde.org/mailman/listinfo/digikam-devel