compare grayscales

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compare grayscales

Manuel Jose Muñoz Martinez
I´m working with grayscale ultrasound images. I want to compare then. Is
there any way to make this?. I´d like to assign the brighter level in the
image to air (for example air = 255 in a 8 bit grayscale) and make the whole
image relative to this value. How could I modify the histogram to achieve
this?