On Jul 16, 2005, at 7:55 PM, Anthony Farr wrote:
Consider that each pixel of Bayer array capture is interpolated
against its
eight neighbouring pixels, and each of those neighbouring pixels is
likewise
interpolated against its eight neighbours, and so forth across the
entire
entire sensor. So it is apparent that there is an erosion of the dof
principle here, and that what you witness when you view a digital
photo is
not the natural dof of a particular lens but a dof that has been
substancially altered by the digital process.
Spatial resolution, captured as luminance, is not interpolated. Color
value, captured and rendered by the Bayer, in interpolated. DOF has
to do with spatial resolution, not color value.
The only ways that digital dof can be compared to analog dof would
be to
capture on a monochrome sensor, on a Foveon sensor, or to analyse the
uninterpolated RAW image of a Bayer arrayed sensor.
Well, as Bill Robb said, I can take a picture on a piece of film and
I can take a picture with a digital camera and compare them pretty
easily.
Godfrey
