Problem of remove noise node

I try to use "removeNoise" to denoise a part of pic and cover it back to orignal pic. The result is a black edge appeared on the edge of the overlaid image. I guess that is caused by the ALPHA value and try to use "alpha divide" and "alpha multiply", but it's useless.Does anyone know how to fix it?

after.png (442.47 KiB) Viewed 922 times

Nobody knows?

It's all but impossible to know what's going on without seeing your flow, but I'll make a stab in the dark. Are you cutting out a section of the image, denoising, then putting it back over the top? The denoise might be pulling some black pixels in from the edge. If that's what you've been doing, try reversing the order of operations: Denoise the entire image, then mask it, and Merge the result.

It's all but impossible to know what's going on without seeing your flow, but I'll make a stab in the dark. Are you cutting out a section of the image, denoising, then putting it back over the top? The denoise might be pulling some black pixels in from the edge. If that's what you've been doing, try reversing the order of operations: Denoise the entire image, then mask it, and Merge the result.

The problem is sloved, thank you for your reply.