I'm surprised to find artifacts in the normal maps created by this plugin. As no one has reported this before, I assumed it was something unique to my system or I was doing something wrong. I tried it on a different system, but got similar results. One is a Dell laptop with an integrated GPU, the other is a Falcon NW with a discrete nVidia card. The laptop is running Windows XP Professional, SP3. The desktop is running Windows XP Home, SP3.
Although the artifacts appear to be present most of the time, they are most obvious when derived from artificial displacement maps with steep contours.
The following picture shows the displacement map on the bottom, an artifact free normal map created from it in the middle, and one showing the artifacts at the top.
I also created a normal map while zoomed in near the center at 800%. The resulting map is show below zoomed at 200% so you can see the artifacts more clearly. Note that the portion that was visible on the screen does not have the artifacts.
The issue seems to be associated in some way with the aspect of the image and the zoom level when it is made. I tried with and without antialiasing, and with both normal blending and overwrite. I tried with the dimensions in pixels equal to powers of two and not. These seem to have no affect. I also tried NormalMapPlus in a new installation of Paint.Net (3.5.10) with no other .dlls in the Effects folder.
If I have missed something obvious, I apologize. I understand that you converted this from someone else's work and may not be able to fix this. I would like to know if others can reproduce my results.
Edited by Vince, 24 December 2012 - 11:27 AM.