How to prevent shape layer masks from creating a contour?

[chris5D9A]

Hey there! 🙂 

I just wonder... when I mask an image by using a shapes' alpha channel it will create an ugly contour (it seems that the shape layer won't make a 100% overlay above the image below it and that the edge of the original image below comes through, without the colored and multiplied layer style of that shape mask layer above it)

Is there any way to prevent that? the actual contour of the shape is fully disabled.

[Jose Panadero]

Could you share a screen capture of your timeline? Press UU to reveal all modified properties. I cannot reproduce your problem. Also share with us what AE version are you using.

[chris5D9A]

I kinda have a talent to create issues like these 😄 ... sadly ...

I hope this is what you meant (let me know if german is an issue here I will change the language to en:

Also ist the latest (at least I believe 22 is the latest version?)

[Jose Panadero]

No problem with the german version! One more question: any of the shapes layers used as alpha mattes includes strokes??

Could you share this composition (or project) with us to review it?

[chris5D9A]

Sure! Really curious what will turn out to be the "issue" here

[Jose Panadero]

I've replace your JPG with a solid and with another image an there is no problem. Have you tried to convert that JPG file into any other format?

[chris5D9A]

So damn weird! Could you send me over your edit? So that I can look into it over here myself 

What format would you suggest? I will play around a bit but for now this issue kinda makes 0 sense? 

[chris5D9A]

No matter what I try, as soon as an image got bright parts, these parts will be clearly visible as thin line. Darker parts won't show up like this of course because I assume it blends in with the dark overlay.

[chris5D9A]

Correction: Darker parts won't blend in as they should. They won't cause a white line they will end up in a dark line as you can see here... as if the shape would only cover 99.99% of the image beneath 

[chris5D9A]

[chris5D9A]

Here its more obvious. on the left you can see the normal shape mask without any overlay and you can see that there is a "transition stripe" between the mask and the background fill layer (black one). When I fill the shape mask with a color and make the shape layer visible you can see that "transition stripe" won't be affected by this somehow...

[Jose Panadero]

Could you share the JPG image that you are using? I will share my project once I can test with your image.

[chris5D9A]

I tested different images as well but for sure! Here you go 

[Jose Panadero]

I've used your project with a complete new image and i can reproduce your problem. Not sure why this is happening. The way I've "solved" is to use the shape layer as alpha matte and a copy of that shape with an extra stroke with the same color as the multiplied layer.