how to find amplitude of an image ?

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Der Turbanator el 9 de Ag. de 2018

Editada: jonas el 9 de Ag. de 2018

i am trying to find the amplitude of an image ist it correct to just take abs value or how can i find amplitude of an image

jonas el 9 de Ag. de 2018

Editada: jonas el 9 de Ag. de 2018

What does amplitude mean in this context? Intensity?
Is it a grayscale image?
Why abs? There are no negatives in the image matrix (except perhaps some specific color space)

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