Is there a way to add stroke and fill to a mask?
Basically I want to show the difference between picture quality from camera A to B.
I already know how to do an "Add" operation to show side-by-side footage from A to B, but I can't seem to add a stroke or fill to the mask doing this operation.
You can apply the stroke effect to add a stroke to a mask path. You can also add a fill effect, but this would fill all the pixels on the layer. You can adjust the opacity of the fill.
You could also use shape layers. I'm not completely sure what you're trying to do. A little more detailed explanation would help.