• Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint
Share this Page URL
Help

Hour 15. Compositing Part 2: Alpha Chann... > Working with Alpha Channel Transpare...

Working with Alpha Channel Transparencies

Most video clips and many graphics have alpha channels. Coupled with an image's red/green/blue (RGB) color information, an alpha channel defines how clips or graphics will be displayed over a background image.

The alpha channel uses 8 bits of information to describe 256 shades of gray. In typical computer graphics, white regions of the alpha channel are opaque—that is, they cover any clips beneath them on the timeline. Black is transparent and lets any lower clips show through. Finally, gray lets some background come through, depending on the level of gray.


PREVIEW

                                                                          

Not a subscriber?

Start A Free Trial


  
  • Creative Edge
  • Create BookmarkCreate Bookmark
  • Create Note or TagCreate Note or Tag
  • PrintPrint