Thursday, July 19, 2012

Hue, exposure, gamma

As promised, we will now take a look at the other three image manipulation tools that lie inside the Nomacs image manipulation dialog: hue, exposure compensation and gamma correction. The range of changes that we can make are:

Hue from -180 to 180. Step size for the bottom picture is 36.

Exposure compensation from -6 to 6. Step size for the bottom picture is 1.2.

Gamma correction from 0.01 to 9.99. The bottom picture shows changes for gamma 0.1, 0.2, 0.4, ..., 1.0, 2.0, 4.0, ..., 8.0, 9.99.

Gamma and exposure changes in the top and bottom slider range are very extreme. If we are changing 24 bit images then we also have a great loss of data. So the values in the extreme zones are not recommended unless if the images are very under or over exposed.

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