The Find Edges effect identifies the areas of the image that have significant transitions and emphasizes the edges. Edges can appear as dark lines against a white background or colored lines against a black background. If the Find Edges effect is applied, images often look like sketches or photographic negatives of the original.

Invert

Inverts the image after the edges are found. When Invert isn’t selected, edges appear as dark lines on a white background. When Invert is selected, edges appear as bright lines on a black background.