Dot gain (also known as Tonal Value Increase) is a phenomenon in offset lithography and some other forms of printing which causes printed material to look darker than intended. It is caused by halftone dots growing in area between the original printing film and the final printed result. In practice, this means that an image that has not been adjusted to account for dot gain will appear too dark when it is printed. Dot gain calculations are often an important part of a CMYK color model.
Read more about Dot Gain: Definition, Causes, Yule-Nielsen Effect and "optical Dot Gain", Controlling Dot Gain, Computing The Fractional Coverage (area) of A Halftone Pattern, Models For Dot Gain
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