Rockbox mail archiveSubject: Re: Making absolute point mode default
Re: Making absolute point mode default
From: Antony Stone <Antony.Stone_at_rockbox.open.source.it>
Date: Wed, 27 Oct 2010 01:22:33 +0200
On Wednesday 27 October 2010 at 00:45, Paul Louden wrote:
> On 10/26/2010 5:40 PM, Antony Stone wrote:
> > I find this question hard to manage - isn't resolution a quantity, which
> > is measured in units of DPI?
> > How can screens of different DPI have the same resolution?
> DPI means "dots per inch." Resolution is an absolute measure of dots. A
> 1280x720 16 foot projector has the same resolution as a 1280x720 9 inch
> netbook. But the DPI of them is drastically different because while the
> number of dots is the same, the physical area of the screen isn't.
I think you're confusing pixels with resolution.
Pixel (or dot) density refers to the total number of dots on a device (no
matter what size it is).
Resolution is the number of pixels (or dots) in a given distance or area
A printer with a resolution of 300dpi is a 300dpi printer, no matter whether
it takes A6 paper or A0 paper.
A display screen with a resolution of 75dpi is a 75dpi screen, no matter
whether it's 1.5" across or 12" across.
From http://en.wikipedia.org/wiki/Display_resolution -
"the use of the word resolution here is a misnomer, though common"
"resolution properly refers to the pixel density, the number of pixels per
unit distance or area, not total number of pixels"
See also http://en.wikipedia.org/wiki/Pixel_density
-- If you were ploughing a field, which would you rather use - two strong oxen or 1024 chickens? - Seymour Cray, pioneer of supercomputing Please reply to the list; please don't CC me.Received on 2010-10-27