Sky replacement issues

[karlthefirst]

Hi everyone, I’m new to all this but have found these forums so helpful. Hoping for another win here. So thanks to the plethora of Affinity videos I’ve learned to do a sky replacement even with complex tree lines all over the top of the sky area I want to replace. I’ve even just learned the process of using a single RGB channel, creating a grayscale layer with high contrast, etc, in order to use the flood selection tool to create my original sky that’s to be masked. Only problem is that while the end result is technically working right in terms of layers, I always seem to get a whole lot of what I can only describe as ghosting around the tree lines:  white echoes of the tree tops, limbs, etc all over the edges of mask layers. Is this just a shortcoming of trying to create such a detailed mask layer selection? Or is there some way to avoid this even in complicated scenarios like this? (I just tried to attach a photo of the issue but the upload failed. So a secondary question- any idea why I wouldn’t be able to attach a copy of the photo from iCloud Drive to include on this forum?)

As always, thanks SO much in advance for any help,

Karl

[huebi]

9 hours ago, karlthefirst said:

I always seem to get a whole lot of what I can only describe as ghosting around the tree lines:

Depens on how you select the sky... do you do a refinement?

[karlthefirst]

Hi, yes I always do a refinement, but lately I’ve been finding (and this is usually in the iPad version) these ghosts or echoes above the tree lines once I mask it and replace the sky. Really wish I could figure out how to attach a photo. Gonna work on that.

[karlthefirst]

OK I needed to upload a lower-res version but hopefully the ghosting will still be pretty visible. Obviously this is a really complicated sky replacement because of all the trees- I was just trying it out to see how it worked. But even with much simpler skylines I’m seeing lesser but still noticeable white tree echoes. Any thoughts?