LightZone: Blending Modes
Description: Description of the various blending modes.

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# Blending modes

Most tools can have a blending mode specified for them. A blending mode controls how the effects of tools in the tool stack blend together to form the final photo. In order to understand blending modes, there are a few terms to know:

Base color
  This is the color of a pixel before a tool's effect has been applied to the photo.
Blend color
  This is the color of a pixel after a tool's effect has been applied to the photo.
Result color
  This is the color of a pixel after its base and blend colors have been blended together using a blending mode.

This is illustrated in the figure below. First, as shown by the green arrows, the base colors of a photo have a tool's effect applied to them producing the blend colors. Second, as shown by the red arrows, the base and blend colors are blended together using a blending mode producing the result colors.

There are many blending modes to choose from. While descriptions for each are below, it's best to experiment.

Normal
  This blending mode has no effect; therefore, the blend and result colors are the same.
Average
  This is the same as the Normal blending mode but at 50% opacity.
Color Burn
  Darkens the base color to reflect the blend color by increasing contrast. (Opposite of Color Dodge. See also: Soft Burn.)
Color Dodge
  Brightens the base color to reflect the blend color by decreasing contrast. (Opposite of Color Burn.)
Darken
  The result color is either the base or blend color, whichever is darker. (Opposite of Lighten.)
Difference
  Subtracts either the blend color from the base color or the base color from the blend color depending on whichever is brighter. (See also: Exclusion.)
Exclusion
  Creates an effect similar to, but lower in contrast than, the Difference blending mode. (See also: Negation.)
Hard Light
  This blending mode multiplies or screens the colors, depending on the blend color. If the blend color is lighter than 50% gray, the color is lightened (screened); if the blend color is darker than 50% gray, the color is darkened (multiplied). This is useful for adding highlights or shadows to an image.
Lighten
  The result color is either the base or blend color, whichever is lighter. (Opposite of Darken.)
Midtones
  This blending mode is the same as the Normal blending mode except that the effect is applied only to midtones.
Mid+Hilights
  This blending mode is the same as the Normal blending mode except that the effect is applied only to midtones and highlights.
Multiply
  This blending mode multiplies the base and blend colors. The result color is always darker. The effect is similar to drawing on the image with multiple marking pens. (See also: Screen.)
Negation
  This blending mode is similar to the Exclusion blending mode except that it shows brighter and more vibrant colors.
Overlay
  Multiplies or screens the colors depending on the base color. Patterns or colors overlay existing pixels while preserving the highlights and shadows of the base color. The base color is not replaced, but is mixed with the blend color to reflect the relative lightness or darkness of the original color.
Screen
  This blending mode is similar to the Multiply blending mode except that it multiplies the inverse of the blend and base colors. The result color is always lighter. The effect is similar to projecting multiple photographic slides onto the same screen.
Shadows
  This blending mode causes only the shadows to be affected.
Soft Burn
  This blending mode is similar to the Color Burn blending mode except that the effect results in less saturation and contrast.
Soft Dodge
  This blending mode is a combination of both the Color Dodge and inverse Color Burn modes, but much smoother than either. The base colors are darkened slightly with very bright blend colors dodged in.
Soft Light
  This blending mode darkens or lightens the colors depending on the blend color. The effect is similar to shining a diffused spotlight on the image. If the blend color is lighter, the image is lightened as if it were dodged; if the blend color is darker, the image is darkened as if it were burned in.