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Which gray-level transformation increase the dynamic range of gray-level in the image?

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Which gray-level transformation increase the dynamic range of gray-level in the image?

(a) Power-law transformations

(b) Negative transformations

(c) Contrast stretching

(d) None of the mentioned

I got this question in an interview for job.

The query is from Piecewise-Linear Transformation Functions in portion Intensity Transformations and Spatial Filtering of Digital Image Processing

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Right choice is (c) Contrast stretching

The explanation: Increasing the dynamic range of gray-levels in the image is the basic idea behind contrast stretching.

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