Re: [genphoto] scanner with transparancy carrier
- Have been shopping on the Internet and do not understand the difference
between "Hardware Resolution: 600 dpi x 2400 dpi" and "Hardware Resolution:
600 dpi x 1200 dpi". The maximum resolution was the same. What difference
will it make in my picture?
Ann in Oklahoma
- They are both 600dpi scanners. This figure is somewhat misleading, because
you need to understand what both numbers mean. The image sensor is made of
a series of cells all in a row that detect the amount of light reflected
from the photo. This sensor actually contains 600 cells per inch (this is
the first figure). As far as I know, they do not make image sensors that
contain any more than 600 cells per inch.
The second figure represents how finely the image sensor and light bar can
inch along the glass. This figure should match the same resolution as the
image sensor. For 600dpi, the scanner should be able to move finely enough
to produce 600dpi per inch of movement. So you get a 600 X 600 dpi square.
If you acquire 600dpi across the image sensor and 1200dpi along the scanner
glass direction, the next scan would overlap some of the pixels acquired in
the previous scan motion. What this really means is that the scanner is
interpolating (making up some phony estimated pixels) to create a 1200 x
Any time a scanner uses interpolation, the image is not going to attain the
same quality that a true optical resolution gives. I never use the
interpolated resolutions of my scanner, because I am not satisfied by the
To determine the true resolution of your scanner, look for the Optical
Resolution figure. In your case, they should both be 600dpi. The marketing
people say "Hardware Resolution" to make you think that is the optical res.
>between "Hardware Resolution: 600 dpi x 2400 dpi" and "Hardware Resolution:Steve Knoblock popular history
>600 dpi x 1200 dpi". The maximum resolution was the same. What difference
>will it make in my picture?
editor@... of photography
www.city-gallery.com and genealogy
>They are both 600dpi scanners. This figure is somewhat misleading, becauseThanks, Steve. I will buy the cheaper one since it will not change the
>you need to understand what both numbers mean.
Ann in Oklahoma