Thanks, John. Very interesting. Jostein Quoting John Francis <[EMAIL PROTECTED]>:
> > > > John, (or Rob or anyone...) > > This may be a stupid question, but is the relationship between lp/mm and > > sensors as straightforward as "two adjacent sensors equal to one line > pair, > > irrespective of sensor colour"? > > Not quite, because the sensor colour does enter into it. > > But if your stimulus pattern is black-and-white lines, > two sensors do equal one line pair, pretty much, if > the interpolation is done based just on intensity. > > If, however, the stimulus is black-and-red (or black- > and-blue) lines, you only get half the spatial resolution, > so you need four sensors to get a distinguishable line pair. > > Black-and-green falls somewhere in between. > > > In real life, of course, most patterns are lower-contrast > than all black/all white, so deliver lower than theoretical > maximum resolution. But they tend to be closer to black-and- > white than to single-sensor colours, so the right limit to > use is the two-sensor-per-line-pair number. > > It all depends on the input colours, the contrast ratio, > and most of all on the quality of the image reconstruction > algorithms (commonly referred to as Bayer interpolation). > > ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.
