[filmscanners] Re: dpi - formerly PS sharpening

["" <nick.grasso@hrads.com>]

Ed Reneger wrote:

>>>Anthony, your comments concerning dpi raised a few questions for me.  I
understand why leaving the dpi at the scanner resolution can slightly deter
theft from those who wouldn't know how to change the size of the image.  By
leaving the dpi at 2700 or 4000, is the file size larger than it would be at
72dpi?  If so, I can see a distinct advantage to reducing the dpi to 72.
Also, by leaving the dpi at 2700 or 4000 are you creating a higher quality
graphic file? If so, than that will give the final user the ability to
create better reproductions.  Wouldn't that overcome the theft advantage of
leaving the image at 2700 or 4000 dpi.<<<

Ed:

I'm not Anthony, but I'm going to jump in here because dpi confused me also when
I first started using Photoshop.

As far as the file stored on disk, and displayed on the screen goes, dpi is just
a single number, *nothing else*. It has nothing to do with the quality of the
file or anything else. It is only used by a printing program to determine the
printed dimensions, and then only if the program chooses to honor it.

One of the reasons for the confusion is that Photoshop (stupidly, in my opinion)
insists on changing the pixel dimensions when you change the dpi. That, of
course, will change your image.

Nick


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