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BlendMode

Package | flash.display
Class | public final class BlendMode
Inheritance | BlendMode Object

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

A class that provides constant values for visual blend mode effects. These constants are used in the following:

- The `blendMode` property of the flash.display.DisplayObject class.
- The `blendMode` parameter of the `draw()` method of the flash.display.BitmapData class

See also

flash.display.DisplayObject.blendMode
flash.display.BitmapData.draw()

Public Properties
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| Property | Defined By
--- | --- | ---
|  | constructor : Object A reference to the class object or constructor function for a given object instance. | Object
|  | prototype : Object [static] A reference to the prototype object of a class or function object. | Object

Public Methods
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| Method | Defined By
--- | --- | ---
|  | hasOwnProperty(name:String):Boolean Indicates whether an object has a specified property defined. | Object
|  | isPrototypeOf(theClass:Object):Boolean Indicates whether an instance of the Object class is in the prototype chain of the object specified as the parameter. | Object
|  | propertyIsEnumerable(name:String):Boolean Indicates whether the specified property exists and is enumerable. | Object
|  | setPropertyIsEnumerable(name:String, isEnum:Boolean = true):void Sets the availability of a dynamic property for loop operations. | Object
|  | toString():String Returns the string representation of the specified object. | Object
|  | valueOf():Object Returns the primitive value of the specified object. | Object

Public Constants

| Constant | Defined By
--- | --- | ---
|  | ADD : String = "add" [static] Adds the values of the constituent colors of the display object to the colors of its background, applying a ceiling of 0xFF. | BlendMode
|  | ALPHA : String = "alpha" [static] Applies the alpha value of each pixel of the display object to the background. | BlendMode
|  | DARKEN : String = "darken" [static] Selects the darker of the constituent colors of the display object and the colors of the background (the colors with the smaller values). | BlendMode
|  | DIFFERENCE : String = "difference" [static] Compares the constituent colors of the display object with the colors of its background, and subtracts the darker of the values of the two constituent colors from the lighter value. | BlendMode
|  | ERASE : String = "erase" [static] Erases the background based on the alpha value of the display object. | BlendMode
|  | HARDLIGHT : String = "hardlight" [static] Adjusts the color of each pixel based on the darkness of the display object. | BlendMode
|  | INVERT : String = "invert" [static] Inverts the background. | BlendMode
|  | LAYER : String = "layer" [static] Forces the creation of a transparency group for the display object. | BlendMode
|  | LIGHTEN : String = "lighten" [static] Selects the lighter of the constituent colors of the display object and the colors of the background (the colors with the larger values). | BlendMode
|  | MULTIPLY : String = "multiply" [static] Multiplies the values of the display object constituent colors by the constituent colors of the background color, and normalizes by dividing by 0xFF, resulting in darker colors. | BlendMode
|  | NORMAL : String = "normal" [static] The display object appears in front of the background. | BlendMode
|  | OVERLAY : String = "overlay" [static] Adjusts the color of each pixel based on the darkness of the background. | BlendMode
|  | SCREEN : String = "screen" [static] Multiplies the complement (inverse) of the display object color by the complement of the background color, resulting in a bleaching effect. | BlendMode
|  | SHADER : String = "shader" [static] Uses a shader to define the blend between objects. | BlendMode
|  | SUBTRACT : String = "subtract" [static] Subtracts the values of the constituent colors in the display object from the values of the background color, applying a floor of 0. | BlendMode

Constant Detail

ADD | Constant

`public static const ADD:String = "add"`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Adds the values of the constituent colors of the display object to the colors of its background, applying a ceiling of 0xFF. This setting is commonly used for animating a lightening dissolve between two objects.

For example, if the display object has a pixel with an RGB value of 0xAAA633, and the background pixel has an RGB value of 0xDD2200, the resulting RGB value for the displayed pixel is 0xFFC833 (because 0xAA + 0xDD > 0xFF, 0xA6 + 0x22 = 0xC8, and 0x33 + 0x00 = 0x33).

ALPHA | Constant |

`public static const ALPHA:String = "alpha"`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Applies the alpha value of each pixel of the display object to the background. This requires the `blendMode` property of the parent display object be set to `flash.display.BlendMode.LAYER`.

DARKEN | Constant |

`public static const DARKEN:String = "darken"`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Selects the darker of the constituent colors of the display object and the colors of the background (the colors with the smaller values). This setting is commonly used for superimposing type.

For example, if the display object has a pixel with an RGB value of 0xFFCC33, and the background pixel has an RGB value of 0xDDF800, the resulting RGB value for the displayed pixel is 0xDDCC00 (because 0xFF > 0xDD, 0xCC < 0xF8, and 0x33 > 0x00 = 33).

DIFFERENCE | Constant |

`public static const DIFFERENCE:String = "difference"`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Compares the constituent colors of the display object with the colors of its background, and subtracts the darker of the values of the two constituent colors from the lighter value. This setting is commonly used for more vibrant colors.

For example, if the display object has a pixel with an RGB value of 0xFFCC33, and the background pixel has an RGB value of 0xDDF800, the resulting RGB value for the displayed pixel is 0x222C33 (because 0xFF - 0xDD = 0x22, 0xF8 - 0xCC = 0x2C, and 0x33 - 0x00 = 0x33).

ERASE | Constant |

`public static const ERASE:String = "erase"`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Erases the background based on the alpha value of the display object. This process requires that the `blendMode` property of the parent display object be set to `flash.display.BlendMode.LAYER`.

HARDLIGHT | Constant |

`public static const HARDLIGHT:String = "hardlight"`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Adjusts the color of each pixel based on the darkness of the display object. If the display object is lighter than 50% gray, the display object and background colors are screened, which results in a lighter color. If the display object is darker than 50% gray, the colors are multiplied, which results in a darker color. This setting is commonly used for shading effects.

INVERT | Constant |

`public static const INVERT:String = "invert"`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Inverts the background.

LAYER | Constant |

`public static const LAYER:String = "layer"`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Forces the creation of a transparency group for the display object. This means that the display object is precomposed in a temporary buffer before it is processed further. The precomposition is done automatically if the display object is precached by means of bitmap caching or if the display object is a display object container that has at least one child object with a `blendMode` setting other than `"normal"`.

LIGHTEN | Constant |

`public static const LIGHTEN:String = "lighten"`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Selects the lighter of the constituent colors of the display object and the colors of the background (the colors with the larger values). This setting is commonly used for superimposing type.

For example, if the display object has a pixel with an RGB value of 0xFFCC33, and the background pixel has an RGB value of 0xDDF800, the resulting RGB value for the displayed pixel is 0xFFF833 (because 0xFF > 0xDD, 0xCC < 0xF8, and 0x33 > 0x00 = 33).

MULTIPLY | Constant |

`public static const MULTIPLY:String = "multiply"`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Multiplies the values of the display object constituent colors by the constituent colors of the background color, and normalizes by dividing by 0xFF, resulting in darker colors. This setting is commonly used for shadows and depth effects.

For example, if a constituent color (such as red) of one pixel in the display object and the corresponding color of the pixel in the background both have the value 0x88, the multiplied result is 0x4840. Dividing by 0xFF yields a value of 0x48 for that constituent color, which is a darker shade than the color of the display object or the color of the background.

NORMAL | Constant |

`public static const NORMAL:String = "normal"`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

The display object appears in front of the background. Pixel values of the display object override the pixel values of the background. Where the display object is transparent, the background is visible.

OVERLAY | Constant |

`public static const OVERLAY:String = "overlay"`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Adjusts the color of each pixel based on the darkness of the background. If the background is lighter than 50% gray, the display object and background colors are screened, which results in a lighter color. If the background is darker than 50% gray, the colors are multiplied, which results in a darker color. This setting is commonly used for shading effects.

SCREEN | Constant |

`public static const SCREEN:String = "screen"`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Multiplies the complement (inverse) of the display object color by the complement of the background color, resulting in a bleaching effect. This setting is commonly used for highlights or to remove black areas of the display object.

SHADER | Constant |

`public static const SHADER:String = "shader"`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 10

Uses a shader to define the blend between objects.

Setting the `blendShader` property to a Shader instance automatically sets the display object's `blendMode` property to `BlendMode.SHADER`. If the `blendMode` property is set to `BlendMode.SHADER` without first setting the `blendShader` property, the `blendMode` property is set to `BlendMode.NORMAL` instead. If the `blendShader` property is set (which sets the `blendMode` property to `BlendMode.SHADER`), then later the value of the `blendMode` property is changed, the blend mode can be reset to use the blend shader simply by setting the `blendMode` property to `BlendMode.SHADER`. The `blendShader` property does not need to be set again except to change the shader that's used to define the blend mode.

See also

flash.display.DisplayObject.blendMode
flash.display.DisplayObject.blendShader
flash.display.Shader

SUBTRACT | Constant |

`public static const SUBTRACT:String = "subtract"`

Language Version : | ActionScript 3.0

Player Version : | Flash Player 9

Subtracts the values of the constituent colors in the display object from the values of the background color, applying a floor of 0. This setting is commonly used for animating a darkening dissolve between two objects.

For example, if the display object has a pixel with an RGB value of 0xAA2233, and the background pixel has an RGB value of 0xDDA600, the resulting RGB value for the displayed pixel is 0x338400 (because 0xDD - 0xAA = 0x33, 0xA6 - 0x22 = 0x84, and 0x00 - 0x33 < 0x00).

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