ActionScript 2.0 Language Reference - Adobe Help and Support

See also
_alpha (MovieClip._alpha property), _alpha (TextField._alpha property)
blendMode (Button.blendMode property)
public blendMode : Object
The blend mode for the button. The blend mode affects the appearance of the button when it
is in a layer above another object onscreen.
Flash Player applies the blendMode property on each pixel of the button. Each pixel is
composed of three constituent colors (red, green, and blue), and each constituent color has a
value between 0x00 and 0xFF. Flash Player compares each constituent color of one pixel in
the button with the corresponding color of the pixel in the background. For example, if
blendMode is set to "lighten", Flash Player compares the red value of the button with the
red value of the background, and uses the lighter of the two as the value for the red
component of the displayed color.
The following table describes the blendMode settings. To set the blendMode property, you can
use either an integer from 1 to 14 or a string. The illustrations in the table show blendMode
applied to a button (2) when superimposed on another onscreen object (1).
Integer
value
356 ActionScript classes
String value Illustration Description
1 "normal" The button appears in front of the
background. Pixel values of the button
override those of the background.
Where the button is transparent, the
background is visible.
2 "layer" Forces the creation of a temporary
buffer for precomposition for the
button. This is done automatically if
there is more than one child object in a
button and a blendMode setting other
than "normal" is selected for the child.