This function returns the current background color associated with the image specified.
Images always begin with the background color set to white.
This is the color that will be used for subsequent calls to any picErase function, such as picEraseRect or picEraseOval . This avoids the need to call picGetBackgroundColor to check the color, do the math yourself, then call picSetBackgroundColor to update it. The following example illustrates how you'd set the background pattern to the fourth frame of this pattern stored in SimpleText. This function returns the pattern of the background in the specified image to its default, namely solid.