- Posts: 31
- Joined: Wed Dec 05, 2018 7:00 am
- Real Name: Xavier Salinas
The line is visible because after you masked out the frame you applied various color corrections that most likely corrupted your edges. Look for the pre/postmultiply checkbox in - at least - your color corrector.
I am not sure if those options are available in the HueCurves tools though.
If they are not then you have to use Alpha Divide and Multiply nodes to make sure the edges get treated correctly.
An alternative way to go about this is do the masking *after* the grading.