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[ChevyRay]

What would be the best way to give all pixels of a certain colour full-transparency in a BitmapData object? So, for example, I want the alpha value of all black pixels to be set to 0.

I could just scan through every pixel and check if it's black, but that sounds painfully inefficient, so I have a feeling there's a better way.

[BorisTheBrave]

BitmapData.threshold

[ChevyRay]

Cool, that worked perfectly! Thanks Boris.

[Glaiel-Gamer]

If you ever want to do something more advanced than just turn black to 0, you may want to look into Pixel Bender too

[ChevyRay]

Yeah, I couldn't even understand the description of Pixel Bender, so I doubt I'll be exploring that kind of territory anytime soon.

[Glaiel-Gamer]

Yeah, I couldn't even understand the description of Pixel Bender, so I doubt I'll be exploring that kind of territory anytime soon.

A simple explanation:

It's a shader. It is a piece of code written (in pixel bender language), that is applied individually to every single pixel on the bitmap (although using parallel processing like a GPU does to do that really really fast). So if you wanted black pixels to take the color of their neighbor with the highest brightness, you could do that.

[ChevyRay]

Cool. Makes sense. I might end up looking into that when I want to get pixel crazy. Thanks!