Transparent image planes in cycles have strange borders I get strange borders on my image planes, even if there is a perfect 100% alpha.



The rendered output looks like this:



I know that this problem was once in the old blender renderer due the "premultiply issue", but now I don't see any premultiply option in cycles renderer.

The node setup is the standard "import image planes" for cycles as shadeless:



Maybe you know a workaround or a setting option in order to fix this?
Seems like there is some aliasing issue with your alpha channel.

I can see two solutions:

Change the texture interpolation from Linear to Closest.



If that doesn't work try adding a Math node to the alpha channel and set the mode to Greater than and the value to .5