Most images have their actual information located in the lower area of the image. Following this convention, this method essentially returns the color of the picture element (pixel) in the top-left corner of the image. Therefore, setting the color returned by :getDefaultBGColor() as the transparent color for a bitmap may produce unpredictable results for images that have part of their information located in the top-left corner!
Method XbpBitmap():getDefaultBGColor() Foundation
Retrieves the default background color of a bitmap.
Syntax
:getDefaultBGColor() --> nRGBColor
Return
The method returns an RGB-encoded color value representing the image's default background color. In case of an error, the return value is equivalent to the #define constant GRA_CLR_INVALID.
Description
The :getDefaultBGColor() method retrieves the default background color of a bitmap. This method can be used to determine the default transparent color of an image, see :transparentClr instance variable.
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