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When is the contrast stretching transformation a linear function, for r and s as gray-value of image before and after processing respectively?

When is the contrast stretching transformation a linear function, for r and s as gray-value of image before and after processing respectively? Correct Answer r1 = s1 and r2 = s2

If r1 = s1 and r2 = s2 the contrast stretching transformation is a linear function.

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