General: alpha channel
An 8-bit layer of a 32-bit graphics model. This particular model consists of red, green, blue (RGB), and transparent (alpha). The alpha channel differs from simple transparency in that you can have semi-transparent colours.
Technically this should only apply to png files, but for tagging purposes it has come to mean any image that has transparent or semi-transparent pixels.
- If the entire background is transparent, also use transparent background.
The following tags are implicated to this tag: transparent_background