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Gamma correction is not worth to do and it can give wrong results.
Gamma correction was used in old TV stations when TV sets were made with valves.
Today a well calibrated computer monitor is already gamma corrected and LCD monitors don't behave as a cathode ray tube and nothing need to be corrected.

You are right - if you talk about an image you want to display. This image needs no correction. But, if you want to create this image, you have to watch for gamma.

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