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How many different values can be picked by gray scale image?

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How many different values can be picked by gray scale image?

(a) 2

(b) 125

(c) 126

(d) 256

I got this question in class test.

This interesting question is from Gray Scale Vs Binary Imaging in division Machine Vision Systems of Engineering Metrology

1 Answer

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Correct choice is (d) 256

The explanation is: For a grayscale image, the intensity of the image varies across the brightness spectrum. This variation is gradual. The intensity is a whole number at any point in a range of 0 to 255, thus it can pick a value from 256 different values.

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