02-02-2018, 01:36 AM
What I do sometimes is create two dupe layers of the original photo layer and then run the Colors->Threshold tool on each, one to find the "edges" where the darkest pixels reside and another to find the "edges" on which the highest-valued pixels live.
You asked earlier "which pixel to pick" with the eye-dropper tool. Using threshold can answer that question. (You can go on to use the threshold layers for other artistic and masking purposes.)
You asked earlier "which pixel to pick" with the eye-dropper tool. Using threshold can answer that question. (You can go on to use the threshold layers for other artistic and masking purposes.)