[filmscanners] RE: dpi - formerly PS sharpening

["Paul D. DeRocco" <pderocco@ix.netcom.com>]

I don't know what units the resolution is measured in: dots per inch or dots
per meter or whatever. And as to what formats indicate resolution, all I did
was open a bunch of files in ThumbsPlus and see which ones had a resolution
listed. It's possible that BMP files have an optional resolution field, and
the file I checked didn't use it.

--

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@ix.netcom.com

> From: Austin Franklin
>
> > JPEG and TIFF both store horizontal and vertical dots per inch in their
> > headers.
>
> Yep, but in TIFF the tag is called "resolution", not "DPI"...
>
> > GIF and BMP don't. I haven't checked other formats, but I expect
> > any modern format do.
>
> Do they store image dimensions, like inches?  They must, since when I read
> in a .bmp file, it knows the exact image size (and resolution).  Hum.  Are
> you sure .bmp files don't store resolution?  The image I read into PS was
> 509 x 761 pixels...at 72 PIXELS/inch...and the dimensions were 7.069 x
> 10.569...obviously, the 72 is a much rounder number to store ;-)

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