Alpha TransparencyAlpha Transparency is a method of implementing transparency for bitmaps.
In Alpha Transparency, for each pixel in the bitmap, a level of transparency ("Alpha Value" stored in the Alpha Channel) which allows images to be smoothly merged into different backgrounds with anti-aliasing. This is useful, as it can be used to prevent unwanted halo effects.
The PNG format supports Alpha Transparency (it actually stores the opacity of each pixel which is the inverse of transparency, but the net effect is the same).
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