Online Help for Chasys Draw IES: Adjustments - Alpha Function

Adjustments : Alpha Function

Alpha Function

Alpha is like Curves, with the exception that it operates on the alpha channel (transparency). It can be used to adjust the alpha channel of an image with a very high degree of control. The transfer function is represented as a graph of output value against input value.

You adjust the graph using control points on a graph. Control points are added by clicking anywhere that there currently is no control point, and may be removed by right-clicking on the desired control point. To move a control point, simply click and drag it to a new location.

It is not possible to have two control points vertically in line with each other, as this would mean that a given input value maps to multiple output values. It’s a logical impossibility, as it translates to a one-to-many mapping.



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