Anti aliasing
Created | Updated Feb 21, 2004
Anti aliasing
Sorry for monosyllable only readers, I do not know a more common word for it. It has to do with the little squares you see sometimes in images, or the funny cartoon like voices you hear on the telephone. Anti aliasing is the technique to mask these squares.
Human perception is funny. Anyone familair with photographs, television and vanishing points in drawings will as soon as the image suggests there is depth see it. This is also the case in seeing shapes on a computer screen. Nobody cares about the 's' not being round but staircase shaped. However, in drawings we can make use of the anti aliasing technique to make curves more curved.
An S made of single sized blocks | An S made of blocks in two sizes |
We need more colours
The previous example is not quite good, I will have to redo it using BGCOLOR. We need more colours. This is one of the disadvantages of anti aliasing. Trying to pump up the resolution we have to use the other domain. The colour depth in the big block 'S' is two, if we increase this to five it should be Ok.
|
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Bottom line: 'Whatever we do in digitising information, it is up to the human perception to interpretate it.'
