On 1/21/02, a number of list members wrote numerous postings . . .
This is a periodic topic on the Medium Format List (how much
better). Bigger images *are* better.
Why?
The MTF (modulation transfer function) of the entire *system* of lens,
recording medium (film or CCD) and printing or projection method
*combined*. You cannot extract information that is not there. It must
survive lens, recording media, and if you print it the printing system, or
if you project it the projection system (including enlarger/projector lens
MTF). Film granularity and CCD pixels are not the be-all, end-all of image
acuity. It's the entire system MTF. When thinking about image enlargement
for printing or projection, consider about 50 lppmm on the recording media
as about the limit, then compute linear enlargement and find the dpi in the
print or projection.
Don't be deceived by "interpolation" and "smoothing" algorithms that create
information or reduce jaggedness of grain/pixelation. It may make the
image more appealing visually, but it's not any more than was started with
beforehand! Interpolation in particular relies *completely* on what *is*
there and fills in holes. If something completely different was in a
"hole" compared to its surrounding information, it cannot be created.
-- John
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