The Map Range node remaps an input value by interpolating it to a newly defined output range. 


Map Range

Figure 1: Map range Node


Map Range Parameters

Enabled - Whether this layer is applied or skipped.

Attach to layer - When selected, this layer modifies the input of the next lower layer that is not itself attached to a layer. Otherwise, it applies to the output of the next lower layer.

Input minimum - The start value of the input range.

Input maximum - The end value of the input range.

Clamp - If enabled, the values are clamped to the minimum and maximum range. Otherwise values outside the range will be unmodified.

Output minimum - The start value of the output range.

Output maximum - The end value of the output range.

Interpolation - Mode used for translation. 

Levels - Number of distinct output levels. Only active when using the Steps or Posterize interpolation methods.

Channels - The channels to which to apply the operation (others are left unmodified).

Opacity - The opacity channel used to control the transparency of this layer.

Blend mode - The blend mode used to mix the RGB values of this layer with those of the background.