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From: Toby Thain <toby@smartgames.ca>
Subject: Re: [Tiff] dpi settings
Date: Sun, 9 Dec 2007 14:04:29 -0200
To: Bob Friesenhahn <bfriesen@simple.dallas.tx.us>
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Status: RO


On 9-Dec-07, at 1:58 PM, Bob Friesenhahn wrote:

> On Mon, 10 Dec 2007, Graeme Gill wrote:
>>
>> Only that it seems to be echo'd in some applications (Photoshop
>> comes to mind, although maybe more recent versions have addressed
>> this), and I'm therefore wondering if it's generally understood in
>> the U.S. that cm is not a preferred metric unit, and in practice
>> seems to be falling out of popular usage in the rest of the world.
>
> Here in the US, the ruler that I have available is marked with  
> inches and centimeters.  Are you saying that rulers in the rest of  
> the world are no longer marked with centimeters?  If they are not  
> marked with centimeters, then what are they marked with?  A ruler  
> marked with millimeters or meters would not be so convenient.
>
> It seems natural that centimeters was used since it is easiest to  
> measure the width and height of a computer screen or page-sized  
> object (e.g. sheet of paper) in centimeters rather than in meters  
> or millimeters.


Also, for resolution units, the magnitude is convenient:
- high resolution imagesetter 1000-2000 lines/cm
- laser printer resolution 100-200 lines/cm
- screen resolution ~30 lines/cm
etc

--Toby

>
> Bob
> ======================================
> Bob Friesenhahn
> bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/ 
> bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
>
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