I have some troubles with the thresholding of electrolytically etched duplex steel. As you can see in the picture below, one phase colours blue, the other something between white and yellow.
Because the lightest blue in the blue phase is as bright as hte darkest white in white phase thresholding is very difficult. If it would be possible to place a 1-pixel thick line between both phases, i could walk through all pixels starting and change the color until a black line is passed, then color white until the next black line is passed, …
Could anyone help me separating the phases of placing a 1- pixel thick, closed line between the phases.
THanks in advance!