Tony Sleep replied to Mark T.:
> > Eeek. I thought grain-aliasing and film resolution was covered in
> > either lesson 1 or 2 when you do Filmscanning 101..! :)
> We agreed that the fundamental mechanism was aliasing arising
> from grain pattern interference with the matrix of pixel geometry.
> His investigations resulted in the feature at
> http://www.photoscientia.co.uk/Grain.htm which
> remains the most thorough attempt at an explanation - you
> still won't find it in any text books AFAIK.
I have no doubt that what you say may be true. However, one thought that
occurred to me when comparing a scanned print with a scanned negative is
that the print has a lower tonal range. I seem to remember that the print
contains about an order of magnitude less brightness range than a negative
or slide. Hence, when you scan a print, you will naturally get less tonal
gradation. I like the reasoning in the second half of the article better.
Dave B.
