it always leaves a mark on the slices, I've tested it by lowering the input resolution by several %, my GPU has 2GB of dedicated memory and CPU 4, and I put these values in their proper fields, the resolution of my image is 1568x896, what do I do ?
The problem is your 2GB of VRAM.
You should imagine that for each GB of vram, you can contain max 100x100px, for example:
this tool doesn't work for me if it leaves these crop marks, how do I contour this, or is there another tool that doesn't leave these crop marks?
