On Wed, 27 Oct 2004 17:29:21 -0400, Mark Roberts wrote: > Anders Hultman <[EMAIL PROTECTED]> wrote: > > >Shel Belinkoff: > > > >>What are "quantization effects?" > > > >The effect that comes from that you only have distinct levels to play > >with, and that subtle changes have to be either on or off. > > Only if you're using a linear scale.
I think the explanation works better if you leave out the math comparison. Think of it this way. What if you have an sensor that can resolve 250 different shades of, say, gray. But what if you're taking a picture of a scene with 2500, 25000, 250000 different shades of gray. IOW, a continuous tone scene, like the ones you'd take pictures of. Well, if your sensor can distinguish 250 shades, and the scene has 2500 shades, then ten shades from the scene get represented as the same one of the 250 shades that the sensor can distinguish. This leads to "banding" which is in some ways similar to solarization (or posterization, I can never keep them straight). TTYL, DougF KG4LMZ
