This filter is not affected by the image-gamma since it only
compares the levels.
Images from Canon eos*cds*3 digital camera are not affected much if
at all by Neighbors=1 and Difference=0.
This tells that there are a lot of invisible image information in the image
so these images can be edited well.
Images from Olympus 400z digicam
are inverted completely at Neighbors=3 and Difference=0 and they are strongly
affected by Neighbors=4 and Difference=0. This tells that there is not
much invisible image information in the image. Olympus 400z is good
in that there usually are not very large flat areas.
First thing to do when the
filter opens is to Shift-Click the preview + button in order to have the
1:1 zoom in the preview box. Then drag the image so that a representative
area is shown, the dragging is not limited to the preview box boundaries.
It is often very necessary to have the 1:1 zoom ratio in the preview box
in order to see the result of this filter correctly.