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Re: [OM] dots and pixels per inch

Subject: Re: [OM] dots and pixels per inch
From: Andrew Dacey <frugal@xxxxxxxxxxxxxxx>
Date: Tue, 13 Jan 2009 21:03:03 -0400
A long time ago I actually wrote up a guide on this and put it on my  
website because I got so tired of answering the questions regarding  
ppi and dpi (and the associated misconceptions) that I'd deal with on  
the photo groups on Usenet (dating how long ago I wrote this). It's  
still available at:

http://www.tildefrugal.net/photo/dpi.php

On Jan 13, 2009, at 10:56 AM, John Hudson wrote:

> To quote www.NetLingo.com
>
> "Resolution
> "A common computing term, it refers to several things. On a computer
> monitor, it is the number of pixels (horizontally) and lines  
> (vertically) on
> the screen. For printers, resolution is a measurement expressed in  
> dpi that
> describes the sharpness of a printed image. With sound boards, it  
> is the
> number of bits used to encode sounds. And in business, it describes  
> some
> form of mutual agreement."
>
>
>
> My printer will work at the following print resolutions; draft, 360d 
> [ots]
> per inch through various steps to 2880 d[ots] per inch
>
> Whenever I get prints done out of the house the photo lab asks for  
> images at
> no less than 300 p[ixels] per inch.
>
> Is anyone able to provide a clear explanation of the relationship  
> between
> pixels per inch and dots per inch ?
>
> Does an increase in pixels per inch generate an increase in dots  
> per inch or
> are the two mutally exclusive ?
>
> If a printer's technology can only deliver a maximum or so many  
> dots per
> inch is there a formula to show that an image resolution beyond so  
> many
> pixels an inch is un-necessary ?
>
> If this question has already been flogged to death I apologise for  
> asking
> again.
>
> John Hudson
>
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> -- 
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