The Room Coloration controls work in conjunction with the selected Room Type. Coloration takes the characteristic resonant frequencies or EQ traits of the room and allows you to apply this spectral shape to the reverb.
In addition to letting you adjust the overall sound of the room, the high-frequency and low-frequency components are split to allow you to emphasize or de-emphasize the low and high frequency response of the room.
Coloration adjusts how much of the EQ characteristics of the selected Room Type are applied to the original signal. The range of this control is from 0% to 200%. A setting of 100% provides the optimum coloration for the room type. Settings above 100% will tend to produce extreme and unnatural coloration.
High Frequency Color (HF Color) adds or subtracts additional high frequency coloration, or relative brightness, to the acoustic model of the room. The range of this control is from –50.0% to 50.0%.
Low Frequency Color adds or subtracts additional low frequency coloration, or relative darkness, to the acoustic model of the room. The range of this control is from –50.0% to 50.0%.