Right this is now I see it ...Aliasing refers to visual artifacts perceived by the eye which are a result of the display technology and not intended to be present. Ie, when a line is nearly horizontal or vertical on a monitor you can see steps along it (commonly called jaggies).
This all started with things like font rendering (which is a highly developed a scary subject in its own right) but applies to any computer graphics.
So, in order to remove the aliasing which has occured, you do 'anti-aliasing'. This is any procedure which reduces the aliasing although these days it's tends to revolve around super-sampling (making the image bigger than you needed and then reducing it) or some form of filtering (bi-linear / cubic etc...).
As a term it pre-dates photoshop by about 20 years and goes back to the first digital typesetting and so on.
(This all started with things like font rendering (which is a highly developed a scary subject in its own right) but applies to any computer graphics.
So, in order to remove the aliasing which has occured, you do 'anti-aliasing'. This is any procedure which reduces the aliasing although these days it's tends to revolve around super-sampling (making the image bigger than you needed and then reducing it) or some form of filtering (bi-linear / cubic etc...).
As a term it pre-dates photoshop by about 20 years and goes back to the first digital typesetting and so on.
Hagbard ... it's been a long time.,
Mon 15 Dec 2003, 19:18,
archived)
aliasing in generalis where a signal is distorted by undersampling. Where you haven't taken enough data points to accurately represent the image.
In normal sampling there's a certain rate at which aliasing begins to occur, but I'm not sure about how it applies to images, since I nearly failed DSP so I didn't take image processing
(In normal sampling there's a certain rate at which aliasing begins to occur, but I'm not sure about how it applies to images, since I nearly failed DSP so I didn't take image processing
kitty meow meow,
Mon 15 Dec 2003, 19:21,
archived)
I never did DSP stuff ... GC for me.I hadn't twigged that you were not the original question asker, sorry if my replies have seemed a little dumbed down.
( Hagbard ... it's been a long time.,
Mon 15 Dec 2003, 19:31,
archived)
It's okI'll just have to ask my friend who has a doctorate in image processing :)
( kitty meow meow,
Mon 15 Dec 2003, 19:33,
archived)