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Re: [OM] dots and pixels per inch

Subject: Re: [OM] dots and pixels per inch
From: John Hudson <OM4T@xxxxxxxxxxx>
Date: Tue, 13 Jan 2009 21:59:09 -0400
Hey Mr Dacey ...

Are you still in Halifax, Nova Scotia ? Long time no hear from you. Unlike 
previous "you dummy" tone responses to my initial enquiry, the DPI section 
of your piece goes to the heart of the matter and confirms what I had been 
thinking from the outset. Thanks..

John Hudson


----- Original Message ----- 
From: "Andrew Dacey" <frugal@xxxxxxxxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Tuesday, January 13, 2009 9:03 PM
Subject: Re: [OM] dots and pixels per inch


>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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>> -- 
>> _________________________________________________________________
>> Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
>> Archives: http://lists.thomasclausen.net/mailman/private/olympus/
>> Themed Olympus Photo Exhibition: http://www.tope.nl/
>>
>
> -- 
> _________________________________________________________________
> Options: http://lists.thomasclausen.net/mailman/listinfo/olympus
> Archives: http://lists.thomasclausen.net/mailman/private/olympus/
> Themed Olympus Photo Exhibition: http://www.tope.nl/
>
>


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