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http://bugs.kde.org/show_bug.cgi?id=116886
Summary: Proposal for adding a new destripe/denoise technique
Product: digikamimageplugins
Version: unspecified
Platform: Gentoo Packages
OS/Version: Linux
Status: NEW
Severity: wishlist
Priority: NOR
Component: general
AssignedTo: digikam-devel kde org
ReportedBy: d.h.j.takken phys uu nl
Version: (using KDE KDE 3.4.1)
Installed from: Gentoo Packages
OS: Linux
I would like to propose a new plugin that is very effective for removing stripes from slide/negative/positive scans, as well as subtle de-noising without loosing detail. The technique is described here:
http://www.no-hype.com/articles/denoise.htmlFor example, for removing vertical-only noise (like horizontal scanner stripes) from the image, you do this in the GIMP:
1. Duplicate the image to _two_ new layers and place the duplicates on top of the original.
2. Use the 'overlay' effect on the two top layers
3. Use the Gaussian Blur (IIR) effect on the topmost layer. Typical radius is 30 pixels
4. Use the Gaussian Blur (IIR) effect on the middle layer, use a horizontal radius of 30 pixels and a vertical radius of 1.
5. Invert the colors of the middle layer
7. Merge all layers into one.
8. Repeat the process one or more times
I always use the GIMP to use this method for removing scan-stripes and noise, then I switch to DigiKam for re-focussing (amazing plugin by the way!). The results of the combination of destripe/denoise in GIMP and re-focus in DigiKam are really impressive.
It would be very nice to implement this manual destripe/denoise method in a DigiKam image editor plugin. Then I can denoise my pictures entirely using DigiKam.
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