With regard to the scanning problems mentioned by James Chow:
<p>
If the photo program is actually doing a true "decimation", then it is much
same as doing the scan at the resulting resolution. Decimation is a process where input samples are simply skipped in order to produce the output samples. It's faster, and appropriate for low res thumbnails, etc., but inappropriate for quality reductions. (Actually doing the higher
resolution scan and then "decimating" will result in more grain, due to using
a smaller aperature.)
<p>
What you would really like to do is to scan at the higher res and then
resample, using an averaging process. The result is a smoother-toned image
that has the same degree of sharpness as the other resolution.
<p>
When taping, cover the entire "leading" edge of the film with tape, in order to
avoid air-flow problems that could snatch the film from the drum. You can of
course rotate the film to your advantage and then rotate the resulting scan in
Photoshop.
<p>
There are also some scanning aids, such as gels which will fill the void between the film and the drum. These help with problems with scratches, but may also allow you to use less tape. (They have to be cleaned off the film when done.)
Recommendation/Expereince on Film Scanners?
in Medium Format
Posted
With regard to the scanning problems mentioned by James Chow:
<p>
If the photo program is actually doing a true "decimation", then it is much
same as doing the scan at the resulting resolution. Decimation is a process where input samples are simply skipped in order to produce the output samples. It's faster, and appropriate for low res thumbnails, etc., but inappropriate for quality reductions. (Actually doing the higher
resolution scan and then "decimating" will result in more grain, due to using
a smaller aperature.)
<p>
What you would really like to do is to scan at the higher res and then
resample, using an averaging process. The result is a smoother-toned image
that has the same degree of sharpness as the other resolution.
<p>
When taping, cover the entire "leading" edge of the film with tape, in order to
avoid air-flow problems that could snatch the film from the drum. You can of
course rotate the film to your advantage and then rotate the resulting scan in
Photoshop.
<p>
There are also some scanning aids, such as gels which will fill the void between the film and the drum. These help with problems with scratches, but may also allow you to use less tape. (They have to be cleaned off the film when done.)