Re: Help me understand (dpi, scaling, resolution)

On Dec 11, 8:04 pm, barnes_j...@xxxxxxxxx wrote:
I am scanning 35MM slides.

I have read up on the internet on this a bit and mostly see
recommendations to scan at highest dpi the scanner will allow when
scanning slides.  However I have a colleague in the graphics dept who
says better to scan at 300dpi and "scale" it appropriately.

Just a quick example: What do I gain by scanning at 600 dpi scaled to
8 x 10, as opposed to 300dpi scaled to 8x10, when I look at the image,
I do not see much difference in detail, even when I re-sample at both
settings into a zoomed area on the slide which possess detail (such as
spokes on a bike wheel).

Or am i completely off base here and should be scanning at the max
dpi? I noticed when I do this, the scanner software does not allow
scaling.  I also notice that I achieve simlar file sizes when I scale
up a lower dpi scan to a larger target size, when compared to a larger
dpi set to a smaller target size.  Are they apples to apples or are
the images actually significantly different and I just can't see it on
my monitor and 8x10 test printouts I've been making?

Thanks so much in advance, I really want to get this archiving
underway for the family!

I prefer to scan at a high res then you can scale in the scanner
software or resize in your image editor. If I am printing the slides
I will scan at 3200/4000ppi then size to the print size I want. If I
am scanning for PowerPoint, which I do a lot dropping to 8x10 x100ppi
from a 4000ppi image is asking for problems so I scan at 1200ppi.
Where your friends advice makes sense is with flatbed scanning of
prints or art work.

Tom
.

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