User Manual

 Color Burn: Color Burn uses the foreground object’s color values to darken the objects
behind them. This is similar to the photographic practice of burning by increasing the
exposure of an area of a print.
 Darken: Darken looks at the color information in each channel and selects the object’s
foreground or background’s color value, whichever is darker, as the result color. Pixels
lighter than the blended colors are replaced, and pixels darker than the blended color
do not change.
 Lighten: Lighten looks at the color information in each channel and selects the object’s
foreground or background’s color values, whichever is lighter, as the result color value.
Pixels darker than the blended color are replaced, and pixels lighter than the blended
color do not change.
 Difference: Difference looks at the color information in each channel and subtracts
the foreground object’s color values from the background object’s color values or the
behind object’s values from the foreground object’s values, depending on which has
the higher brightness value. Blending with white inverts the color. Blending with black
produces no change.
 Exclusion: Exclusion creates an effect similar to but lower in contrast than the
Difference mode. Blending with white inverts the base color values. Blending with
black produces no change.
 Hue: Hue creates a result color with the luminance and saturation of the background
objects color values and the hue of the foreground object’s color values.
 Saturation: Saturation creates a result color with the luminance and hue of the base
color and the saturation of the blend color.
 Color: Color creates a result color with the luminance of the background object’s color
value and the hue and saturation of the objects in the foreground. This preserves the
gray levels in the image and is useful for colorizing monochrome objects.
 Luminosity: Luminosity creates a color using the hue and saturation of the background
object and the luminance of the foreground object. This mode creates an inverse effect
from that of the Color mode.
Operator
This menu is used to select the Operation mode used when the duplicate objects overlap.
Changing the Operation mode changes how the overlapping objects are combined. This
drop-down menu is visible only when the Apply mode is set to Normal.
The formula used to combine pixels in the Duplicate node is always (fg object * x) + (bg object *
y). The different operations determine what x and y are, as shown in the description for
each mode.
The Operator Modes are as follows:
 Over: The Over mode adds the foreground object to the background object by
replacing the pixels in the background with the pixels from the Z wherever the
foreground object’s Alpha channel is greater than 1.
x = 1, y = 1 - [foreground object Alpha]
 In: The In mode multiplies the Alpha channel of the background object against the
pixels in the foreground object. The color channels of the foreground object are
ignored. Only pixels from the foreground object are seen in the final output. This
essentially clips the foreground object using the mask from the background object.
x = [background Alpha], y = 0
 Held Out: Held Out is essentially the opposite of the In operation. The pixels in the
foreground object are multiplied against the inverted Alpha channel of the background
Chapter – 88 Effect Nodes 1943