Re: frozen cardboard

[P3D Brian Reynolds <reynolds@xxxxxxxxx>]

Dr. T wrote:
> 
> Reply to message from snappy57@xxxxxxxxxxxxxx of Thu, 28 Aug
> >
> >I doubt that my mounting skill has anything to do with it because
> >I'm using slip in mounts and I don't really know what I'm doing
> >yet.  I also don't think it's a matter of my eyes being "educated"
> >because I still notice it in the lenticular prints -- and when
> >viewing side by side prints with a viewer.  I also duplicated some
> >of my slides and mounted them to share with a friend, and I DID
> >notice the cutout effect on the duplicates.
> 
> I find the last sentence interesting... It is possible that reduced
> resolution in the copy encourages this effect... Do you see this reduced
> resolution or would you say that this is a good copy of the original?
> 

Or could it be a difference in contrast between the originals and the
dupes?  I could see how an increase in local contrast (thereby
sharpening edges and making them stand out) could make objects stand
out against one another.  Unsharp masking (which is a different
process that uses a separate sheet of film) is done specifically to
get this effect.

Depending on how you duplicate the slide there might not be much
difference in resolution (e.g., contact printing vs. slide copier
attachments that use a camera's optics), but there would likely be
contrast and color shifts.  Were the slides copied onto regular slide
film, or copy film (which is formulated to try and make up for the
contrast change in copying)?

-- 
Brian Reynolds                  | "Humans explore the Universe with five
reynolds@xxxxxxxxx              |   senses and call the adventure science."
http://www.panix.com/~reynolds/ | - Edwin P. Hubble


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