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From: Toby Thain <toby@smartgames.ca>
Subject: Re: [Tiff] dpi settings
Date: Sun, 9 Dec 2007 16:54:41 -0200
To: Andrey Kiselev <dron@ak4719.spb.edu>
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On 9-Dec-07, at 4:39 PM, Andrey Kiselev wrote:

> On Sun, Dec 09, 2007 at 11:15:51AM -0600, Bob Friesenhahn wrote:
>>> For me centimeter unit is quite inconvenient for the image =20
>>> processing
>>> related usage. I like mm.
>>
>> It seems that the best unit to use depends on what is being measured
>> and the intent of the measurement.
>
> That is very true. And we are talking here about resolution tags which
> intended to set up the relation between image pixels and actual =20
> size of
> paper sheet or display. And millimeters are quite convinent in =20
> measuring
> of paper sheets and displays.

Centimetres also, see previous. Furthermore it does appear to be =20
established convention in pre-press (my old m=E9tier).

--Toby

>
>> For example, if the TIFF file represents a satellite image covering a
>> large expanse of the earth, and it is desired to specify the actual
>> resolution, units of millimeters would be inconvenient.  Perhaps
>> meters or kilometers would be more convenient.  If an image is from a
>> microscope, perhaps nanometers or micrometers would be more
>> convienient.
>
> Oh, no, you are just mesunderstanding the resulution tags purpose. =20
> They
> have nothing to do with the actual image content. The same 300 dpi =20
> image
> can be the view of the whole Earth from space or just a bacteria
> photograph, but it still remains the 300 dpi image. The scale of the
> image content should be established via anther tags.
>
> Best regards,
> Andrey
>
> --=20
> Andrey V. Kiselev
> ICQ# 26871517
> _______________________________________________
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