Find edges in image

[lars-reimann]

Is your feature request related to a problem?

I'd like to be able to find the edges on an image.

Desired solution

• Add method find_edges to Image that returns a new image containing the edges but leaves the original unchanged.
• In the body of the function, first convert the image to grayscale (Convert image to grayscale #287)

Possible alternatives (optional)

No response

Screenshots (optional)

No response

Additional Context (optional)

No response