[filmscanners] RE: dpi - formerly PS sharpening

["Robert Meier" <filmscanner@meierlim.com>]

> -----Original Message-----
> From: filmscanners_owner@halftone.co.uk
> By
> leaving the dpi at 2700 or 4000, is the file size larger than it
> would be at
> 72dpi?

Not really. What your are doing is creating an image with a certain
dimension, i.e. 450x300 pixels. Then you set the dpi to for instance 4000
without changing the dimension of the image. Therefore, the image size stays
the same because the dimension stays the same. The dpi is only a hint to a
program.
The reason why you might be confused with this is because PS will change the
image size when you change the dpi and have resampling checked. The easiest
way to understand the above is with an example. Open any graphics file in
PS. Go to image size (Alt-I-I). Uncheck "Resample Image". Now change the
Resolution to different values. While you do that look at "Width", "Height"
in the box "Pixel Deimesions: xxk". You will notice that the dimension and
file size xx stay the same. Now look at
"Width" and "Height" in the box "Print Size". You will notice that the print
size will decrease with higher Resolution. In other words, if somebody
prints this image from a program that checks the resolution it will produce
the size that it shows in PS.

Robert

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