Layer Blending; Layer Blending Modes - PRG MBOX User Manual

LAYER BLENDING

Layer Blending Modes

In addition to stacking and positioning, Mbox has other tools such as opacity and effects for helping with the basic
compositing of imagery. But aside from special cases like stenciling and one of two of the texture effects, the actual
content on one layer doesn't affect other layers. However, Mbox also includes Layer Blending modes that allow the
color on a layer to blend with the color(s) on underlying layers. In the simplest modes, layer blending can allow layers to
become slightly transparent in darker areas so that one layer can more subtly blend with underlying layers. In the more
complex modes, colors can be changed entirely based on what color is underneath.
Mbox has a default "overlay" layer blend mode that disables any blending, plus seven layer blending modes. The
blending modes are selected using the Blendmode parameter on each layer. The first five of these layer blending modes
have been chosen to best replicate common modes found in commercial image editing software (e.g. PhotoShop®, After
Effects®). The sixth and seventh modes may be useful for creative blending for special effects.
The modes, their values, and descriptions are as follows:
+ 0 = Overlay - layer's colors completely obscure underlying color; no blending.
+ 1 = Additive - layer's colors are added to underlying colors (blacks appear transparent).
+ 2 = Screen - similar to above, with less of underlying color (blacks appear transparent).
+ 3 = Multiply - multiplies a layer's color with underlying color (blacks appear opaque).
+ 4 = Subtractive - layer's colors are subtracted from underlying colors (blacks appear transparent).
+ 5 = Exclusion - underlying colors are inverted where layer color is lighter; layer's colors are then added to underlying
colors (blacks appear transparent).
+ 6 = Invert Subtractive - underlying colors are subtracted from layer's colors (blacks appear opaque).
+ 7 = Invert Additive - layer's colors are inverted and are added to inverse of underlying colors (blacks appear
transparent).
Overlay (No Blend)
Subtractive
Additive
Exclusion
Screen
Invert Subtractive
MBOX® USER MANUAL
Multiply
Invert Additive
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