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How to find the pixel value at any point on a greyscale image(not on an rgb image?)

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Respected sir, I need to find the pixel value on an graylevel image.(not on an RGB image,this can be done using impixel function for RGB image.But i wanted to find it for a grey image.)Is ther any function for this...??

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Matt Kindig
Matt Kindig le 7 Fév 2012
Function impixel works for grey images too. For such an image, all three RGB values will be the same.

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