Some file formats are designed to, or look better with color correction. Gamma is used for this purpose.
Usually, most photographic type files such as RAW, JPEG etc. contain their own color correction settings and these are used when possible by MysticThumbs, however in some formats these are not supplied and the gamma setting can be useful to apply a specific gamma correction to these formats.
A value of 1.0 is default and a value of 2.2 is a common adjustment for photographic images.
Selecting a value of 0 disabled gamma correction.
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