I realized that if I add the scale node in the compositing appear artifacts, in my opinion unjustified, in the render.
this is the render with the problems,
this is the rendering without compositing and without issue
I tried to scale the image with Gimp, and those problems have not appeared
Is this a bug of the compositor?
Does this pattern appear in compositor window also or only in the frames that you render out from compositor? Looks like a file compression issue from JPG or similar format. If it is only in rendered files, set your compression quality higher.
Also make sure you are not using “Nearest” filtering in Transform node.
this is not a bug but a bad behavior of scale node
look the developer’s answer https://developer.blender.org/T47885
This is not a compression problem, as use JPG or PNG with nothing compression or maximum and then because the issue appears in the backdrop that the output
Thank you for your suggestion, if I use the node transform
earest the problem disappears
look the blend https://www.dropbox.com/s/od2dzdsvzhbp24y/noise1.blend?dl=0
