Applying blending modes
Blending
modes involve combining the colors of one image (the base image) with
the colors of another image (the blend image) to produce a third
image—the resulting image is the one that is actually displayed
on the screen. Each pixel value in an image is processed with the
corresponding pixel value of the other image to produce a pixel
value for that same position in the result.
Every display object has a blendMode property
that can be set to one of the following blending modes. These are
constants defined in the BlendMode class. Alternatively, you can
use the String values (in parentheses) that are the actual values
of the constants.
BlendMode.ADD ("add"):
Commonly used to create an animated lightening dissolve effect between
two images.
BlendMode.ALPHA ("alpha"):
Commonly used to apply the transparency of the foreground on the
background.
BlendMode.DARKEN ("darken"):
Commonly used to superimpose type.
BlendMode.DIFFERENCE ("difference"):
Commonly used to create more vibrant colors.
BlendMode.ERASE ("erase"):
Commonly used to cut out (erase) part of the background using the
foreground alpha.
BlendMode.HARDLIGHT ("hardlight"):
Commonly used to create shading effects.
BlendMode.INVERT ("invert"):
Used to invert the background.
BlendMode.LAYER ("layer"):
Used to force the creation of a temporary buffer for precomposition
for a particular display object.
BlendMode.LIGHTEN ("lighten"):
Commonly used to superimpose type.
BlendMode.MULTIPLY ("multiply"):
Commonly used to create shadows and depth effects.
BlendMode.NORMAL ("normal"):
Used to specify that the pixel values of the blend image override
those of the base image.
BlendMode.OVERLAY ("overlay"):
Commonly used to create shading effects.
BlendMode.SCREEN ("screen"):
Commonly used to create highlights and lens flares.
BlendMode.SHADER ("shader"):
Used to specify that a Pixel Bender shader is used to create a custom
blending effect. For more information about using shaders, see Working with Pixel Bender shaders.
BlendMode.SUBTRACT ("subtract"):
Commonly used to create an animated darkening dissolve effect between
two images.
