What steps will reproduce the problem?
1. Create a greyscale image that is also using the color black
2. Turn it into a normalmap with height in alpha
3. Save as TGA
What is the expected output? What do you see instead?
Expected output is a TGA file containing useful data even in the parts that
have alpha value zero (as these still can have a normal vector). But, the TGA
actually contains the RGB values (0, 0, 0) where A is 0.
What version of the product are you using? On what operating system?
GIMP 2.6.8
gimp-normalmap 1.2.2
Ubuntu
Please provide any additional information below.
The issue is most likely in GIMP saving the image, however, this decision done
by GIMP makes sense in MOST cases, as pixels with alpha value 0 usually INDEED
cannot contain any used data. Therefore, it would probably be best to avoid
creation of zero alpha pixels inside gimp-normalmap, and use the alpha value 1
(of 0 to 255) instead.
Original issue reported on code.google.com by
divVer...@gmail.comon 20 Aug 2010 at 2:30