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Normalise an image

Normalise transformation allows users to improve the visual contrast by expanding the brightness to encompass the whole dynamic range.

It scales the brightness values of the active layer so that the darkest point becomes black and the brightest point becomes as bright as possible, without altering its hue. This is often a “magic fix” for images that are dim or washed out.


In most circumstances, there is no noticeable change in the transformed image.

Red, Blue, Green and Luma histograms. Before Normalise (left). After Normalise (right).

The histograms after normalisation contain noticeable variations, as you can see in the image above. These give the pictures a good contrast without drastically changing the way they looked before.

The four histograms are combined into one in the depictions below, which only show their outline. This offers more concrete visual proof of the same.

Histograms outline. Before Normalise.

Histograms outline. After Normalise.
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