Yeah as mentioned, It can be a little confusing at first when using an alpha channel.
Alpha, not only is it the first letter of the Greek ALPHAbet (second letter Beta, see where the name alphabet comes from?)
It also has a value of 1 in the Greek Numerals System.
Alpha is understood to mean transparency and Opaque means non-transparent
The 0 = Off and 1 = On is correct, however it is not alpha off or on, its more like Opaqueness that is off or on, or somewhere in between.
0 = Opaque Off = Alpha On = Transparent
1 = Opaque On = Alpha Off = Non Transparent
Confused?
When Alpha means 1 or transparent, but needs to be set to 0 to actually be transparent.
Opaque channel makes more sense than Alpha channel. Or switching the value.
