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How to use the coolscan backend for dustremoval with XSANE

Installing

• Download xsane-0.30.tgz from Olivers xsane-page
• untar it (tar xvf xsane-0.30.tgz)
• goto the directory (cd xsane-0.30)
• configure xsane (./configure)
• in frontend/xsane.h : uncomment the line
  /* #define SUPPORT_RGBI */

• make
• make install

How to use xsane for the dustremoval?

• Make sure xsane can be used as a gimp plugin (by making a link from xsane to ~/.gimp/plug-ins/xsane).
• Start gimp and use "Xtns->Xsane" to start xsane
• Do preview (with advanced option Autofocus-> before preview)
• Select a region with a lot of contrast and different colors
• Select "Scan mode -> RGBI" in xsane
• Scan
• When the image is in gimp use "Image->Chanel Ops->Decompose->alpha to seperate the alpha channel from the other channels
• Change in xsane option Ired cor. red and repeat the scanning until this alpha image is basically flat except for the dust. The bigger the value "Ired cor. red" the bigger is the cross-talk-correction from the red channel. Remember the value you used, it should be a constant for the same film-type.
• Use the plugin "dustremove" (see below) in gimp to do the actual dust-removal (select the right threshold with the slider)

If you use xsane as standalone program proceed like this:

• Start xsane
• Select "Scan mode -> RGBI" in xsane
• Select a filename ending on .png
• Do preview (with advanced option Autofocus-> before preview)
• Select a region with a lot of contrast and different colors
• Scan
• Start gimp and load the .png file you just scanned
• When the image is in gimp use "Image->Chanel Ops->Decompose->alpha to seperate the alpha channel from the other channels
• Change in xsane option Ired cor. red and repeat the scanning until this alpha image is basically flat except for the dust. The bigger the value "Ired cor. red" the bigger is the cross-talk-correction from the red channel. Remember the value you used, it should be a constant for the same film-type.
• Use the plugin "dustremove" (see below) in gimp to do the actual dust-removal (select the right threshold with the slider)

Dustremove plugin for gimp