Change color of transparent background

[xigoi]

Is your feature request related to a problem? Please describe.
The default white/gray checkerboard to represent a transparent background is quite distractrng.

Describe the solution you'd like
The ability to change the color(s) for representing a transparent background

Describe alternatives you've considered
The ability to make the checkerboard not align with the image pixels so it doesn't look like it's part of the image

[xigoi]

I think being able to set the two colors of the checkerboard would be good.

Another more extreme idea is to rotate the checkerboard by 45°, so that it can't possibly be confused with pixels.