LayerMaskBitmap property (Main Control)

Visual Basic example
Visual C++ 4.0 example

Syntax short LayerMaskBitmap (short iLayer);

Overview: Refer to Layers in Files

Remarks

Gets or sets the mask bitmap for the layer. The mask bitmap is an 8-bit grayscale bitmap. The value of each pixel in the mask layer bitmap determines the transparency of the corresponding layer bitmap. A value of 0 represents full transparency while a value of 0xFF represents complete opacity. Intermediate values represent translucency. If the mask bitmap does not exist, then the layer is considered to be visible (it is as if the mask bitmap contained only 0xFF pixels.

For more information, refer to FILE FORMATS SPECIFICATION from Adobe.