New to Natron. What parameters do I use to mask a PNG that has an alpha channel? I looked through tutorials and I checked the Premultiply checkbox on the Roto node but it only works with an image without an alpha channel. Nothing happens when I try rotoscoping any PNG with an alpha channel. I have a Read node connected to a Roto node connected to a Viewer node. All other parameters are default.
Use a merge with the merge operation set to mask, A pipe has your roto node and everything else to manipulate your alpha, B pipe has your PNG.
2 Likes
Thank you!