I am cutting some shapes out of a photo so I can animate in AE. I take my photo, dupe it, make a selection/mask on the dupe. I then inverse the selection and delete, leaving me my object. I then go to the original layer, inverse the selection again, and delete, to cut a hole. In AE, I then animate the object from off screen into its correct position.
The problem: there is a thin outline of empty space around my object. Its as if the "marching ants" actually have a thickness. Why don't a selection and its inverse, when combined, make a perfect whole?
Is there a way I can make it so it is perfect, so that the mask doesn't have this pixel overlap property?