BitMakeTransparent

Help Contents Graphics Bitmaps BitMakeTransparent
saveImage BitTrans

BitMakeTransparent bitmap color
BitTrans bitmap color

command which sets the alpha value of the color in the bitmap to 0, so this color will be transparent on BitPaste-ing.

Example: 

b=loadImage "iris.png
BitTrans b rgb 1 1 1
fd 100
BitPaste b

Examples:

References:

saveImage BitTrans