Monochrome Node

The Monochrome node enables you to desaturate the color component of an image to the extent that you specify. The Monochrome node performs the following computation:

R = mN + R(1-m)
G = mN + G(1-m)
B = mN + B(1-m)

(where R, G, and B are the red, green, and blue color values; N is the result of the Luminance computation; and m is the Monochrome Factor parameter value).

Monochrome Parameter Tab

Luminance

The Luminance parameter enables you to specify how the luminance value will be calculated. You can select Film, NTSC, or PAL luminance from the popup menu. For the formulas used by Chalice to compute the three types of luminance, refer to the Channel Swap Node description in chapter 13, "Tool Nodes ."

Monochrome Factor

The Monochrome Factor parameter enables you to control the degree of desaturation of the image. You set the Monochrome Factor parameter by keying in a numerical value between 0 and 1.0 or by using the mouse to set the tuner to the desired value.

A value of 0 yields no change to the image. A value of 1.0 completely desaturates the image, reducing it to a fully monochrome image (grayscale).

Control Image Parameters

The Control Action and Control Channel menus enable you to specify how an optional control image input will govern the node operation, as explained in "Using Control Images with Filter Nodes ."




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