In following image:
I want to make the lines inside the colorful polygons disappear, but leave the line between colorful polygons. For example, inside the green polygon at the right, there are two horizontal yellow lines which I want to remove and make them green like the polygon itself. But I want to leave the lines surrounding the green polygon intact.
I tried to use "eraser", but this changes the yellow lines to transparent lines rather than to green lines.
I tried to use "smudge", but this blends the yellow with the green and creates a dirty-looking image.
What can I do?