Images don't have a resolution per se; display devices have a resolution.
Images (the formats you're talking about, anyway) are measured in pixel
width and height. The height and width in any units other than pixels of
course necessitates conversion - for an easy example, a 300x300 image on a
1200x1200dpi printer will be exactly one quarter the size of the same image
printed on a 300x300 dpi printer.

-----Original Message-----
From: Jome [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, September 18, 2002 8:11 AM
Subject: [PHP] Re: Image resolution and php

> I need to get resolution information (dpi) from any
> image of jpg, gif or png formats.
> It would be sufficient to obtain pixel and inches
> dimension of such images and calculate resolution by
> simply dividing but I haven't found any function that
> gets effective dimensions in inches.

I'm sligthly confused about what you're looking for, but the above URL
*could* be something.


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