Found Image Shape

I think I know the answer but just to confirm...

I want to find an image that has an unusual shape, regardless of the background behind it. For example: a blue diamond shape that might be on a white, red, or even mottled background.

I assume KM always looks for a matching rectangular shape, so KM would always "see and consider" the background of a diamond shape, correct?

...even if I provide (in the action's image well) a blue diamond with a transparent background?


Correct, Keyboard Maestro only looks for rectangular shapes, there is no transparent facilities available.

Depending on the size of the diamond, the size of the search area, and the characteristics of the remaining screen area, you might be able to search for it yourself using the Pixel condition or PIXEL function.