an action on the red channel for a given luminance range, will increase the "R" channel by X%, and at the same time, "G" and "B" channels will be reduced by X%.
Addition and reduction of RGB channels: in this case, according to the luminance (shadows/midtones/highlights), each channel is amplified at the same time the two others are reduced. We can easily find on the internet references to this kind of lagorithm. Blending from target colors: in this case, a chromatic value is weighted according to a formula like: "output hue" = "input hue" + ("target hue" - "input hue") * balance where balance is a coefficient between 0 and 1. In RawTherapee, two types of algorithms try to meet the principles defined above: to extend the toning to the whole luminance spectrum, and not only, in a restrictive way, to the highlights and shadows. It will be possible to tweak this dominant color in the image highlights and/or shadows. the toning of a color image that allows to add a dominant color to the image. coloring highlights in yellow and shadows in blue.Įxtending the concept, we can put under the same definition: 
The first question that arises is: What is the definition of, or what do you hear by, "Color Toning" or "Split Toning"? Indeed, when consulting the Web, we generally find out something like: "Color Toning consist in coloring a black & white image in a different way according to the brightness, e.g. "Color Correction Regions" method with the mask disabled, an extreme example demonstrating color-toning a sky.
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