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Which of the following transformations expands the value of dark pixels while the higher-level values are being compressed?

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Which of the following transformations expands the value of dark pixels while the higher-level values are being compressed?

(a) Log transformations

(b) Inverse-log transformations

(c) Negative transformations

(d) None of the mentioned

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This question is from Basic Grey Level Transformation topic in division Image Enhancement of Digital Image Processing

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The correct option is (a) Log transformations

Explanation: Log transformation derives a narrow range of gray-level values in input image to wider range of gray-levels in the output image, and does performs the above given transformation.

The inverse-log is applied for the opposite.

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