Better is a relative term. Generally higher dpi (technically it should be
spi or samples per inch and not either dpi, dots per inch, or ppi, pixels
per inch) will produce a higher resolution and sharper image than lower
amounts of samples per inch. One has to be careful in making comparisons
about two main things. First, there is the meaning and accurracy of the
specs which the manufacturer gives for their units since different
manufacturers use different measurments and critera without making it clear
exactly what they are using. And secondly, there is the issue of whether
one is using optical resolutions or interpolated resolutions, wherein
optical resolutions are th more significant and reliable resolutions when
compared to interpolated resolutions. Thus, a 300 spi optical scan may be
better than a 600 spi interpolated scan.
1600 X 2400 pixels designates an output size in pixels not a resolution.
Resolutions are always stated in terms of x per inch. I realize that
Microsoft and others call the moniotr display sizes such as 1600 x 2400
display resolutions but they reallyu are talking about the display size not
the reolution per se.
The only time the resolution related to display size is when the display is
on a monitor as opposed to a print, where the same resolution can produce
different sized monitor display images depending on the size of the monitor
and the size of the monitor disply it is capable of in terms of pixels.
filmscanners_owner@halftone.co.uk wrote:
> I'm a bit perplexed at what the dpi means on a film scanner. Trying to
> compare apples to apples, will a 4000 dpi Brand X film scanner in
> theory
> produce a better quality image outputted than a 2000 dpi Brand X
> scanner,
> given that the output resolution is the same, say 1600 x 2400 pixels?
>
> Or does it simply mean the 4000 dpi scanner will output a much larger
> image than the 2000 dpi model?
>
> Thanks for clearing this up,
> Bill
>
>
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