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According to the background image color, how can i change the reticle color which is on an image ?

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Mahesh
Mahesh 2014-6-18
I know this will be the solution
A = imread('peppers.png'); imshow(A) set(gcf, 'Pointer', 'fullcrosshair')
But i want to know how it works (logic/methodology) ?
Thanks
mahesh

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