Member variable XbpBitmap():transparentClr Foundation
Transparent color in the image.
The :transparentClr instance variable specifies the background (key) color of the image, that is, the color of the area of the bitmap that should be displayed transparent by the :draw() method. This process is called background masking or chroma keying. By default, :transparentClr contains the value GRA_CLR_INVALID which denotes "no transparency". To set transparency for a bitmap, specify an RGB color value in this instance variable prior to calling :draw(). Alternatively, you may use one of the colors predefined in XBP.CH (XBPSYSCLR_) or GRA.CH (GRA_CLR_).
|GIF||Compuserve Graphics Interchange Format|
|PNG||Portable Network Graphics. Note: This format also supports per-pixel transparency (alpha channel) in images with 32 Bit color depth. If per-pixel transparency is used, the value in :transparentClr is ignored.|
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