[filmscanners] Re: dpi - formerly PS sharpening

["Anthony Atkielski" <anthony@atkielski.com>]

Paul writes:

> Just changing the dpi number doesn't change
> the size of the file; it changes the size
> (in inches) of the image.

Sort of.  An image file doesn't actually have a size in inches.  However, if
you record a DPI setting in the file, and if a program reading the file
chooses to calculate the image size by dividing the pixel dimensions of the
image by the DPI setting, then yes, within the context of that program the
image has a physical size.  Not all programs do this, however, so it's quite
an unpredictable way of sizing an image, which is why it is usually best to
ignore DPI unless you actually intend to print the file.

> Web browsers ignore it.

They appear to.  However, most browsers allow you to print pages, and they
might look at it then (I don't know for sure, because I never print pages
with my browser).

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