Predefined Functions – alpha
|Function name:||alpha – Return alpha component of argument|
|Input data type||Output data type|
This function takes a color variable as input and returns the transparency (alpha value) of the color. Normally the transparency of a color is between 0 and 1. Colors can be created by using one of the color creation functions:
Internally colors are stored in RGBA format, thus this function is fast as it only needs to return one of the stored components of the color.