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[filmscanners] Re: dpi - formerly PS sharpening



On Thu, 15 Aug 2002 21:45:28 -0400, you wrote:

>> 2592x3888 pixels, 2720 dpi, 4x6inch, 22.7MB
>>
>> So it *is* saving a resolution in dpi
>
>I believe it is simply calculating the DPI.  It's certainly easy enough to
>do...  What file format are you talking about, BTW?

TIFF files.

>
>The numbers you gave above don't seem to "fit"...did you make those numbers
>up, or is that from a resized image?  

oops, yeah.  The dpi figure in the above should b e 618.  A scan from
a slide I just did read:

2396x3694, 2720 dpi, 0.81x1.36", 19.9MB

Better, eh?  :-)

>When you read the image back into
>Viewscan (I assume you can do this), does it still have the dpi it was
>scanned at, even after resizing? 

No, it doesn't, it's changed.  Interesting, I had never done that -
re-looked at an image on disk with the scanning software.  I just
called up an unaltered TIFF.   Why is that?  Would it help if I cited
the changes?  Looks like I could learn something from this.  I better
send one through paying close attention to all the settings.


>How about images from another scanner?
>There are many fields in a lot of the standard file formats that simply go
>unused...and most people don't support.
>
>I'll ask Ed about this...he's gotten quite busy these days, so I won't hold
>my breath...

Ken Durling

Visit my new easier-to-browse PhotoSIG portfolio:
http://www.photosig.com/viewuser.php?id=203

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