RE: Nielsen's Rating

Subject: RE: Nielsen's Rating
From: "Geoff Lane" <geoff -at- gjctech -dot- co -dot- uk>
To: "TECHWR-L" <techwr-l -at- lists -dot- raycomm -dot- com>
Date: Tue, 3 Jul 2001 17:10:40 +0100

Arlen P. Walker wrote:
>
> Interesting figure, that 40%. I suspect it's based entirely
> in fantasy, as
> I've yet to have a confirmed sighting of even a single system
> with less
> than 90dpi (which was the minimum number under discussion,
> not 96). Not in
> my company, not among friends and acquaintances, not at my daughters'
> schools, not anywhere. (That's a sample size of a few
> thousand machines,
> though non-randomly selected.)
---

More important thant the dpi figure is the ppi resolution at which you use
the monitor. This is because pixels are the smallest discernable elements no
matter how many phosphor dots or TFTs each maps to. For example, a 21"
monitor (20" visible) has a resolution of only 64ppi at 1024 x 768. My
last-but-one client set up its workstation computers (all 3,000 of them)
like this -- and most users left them that way. FWIW, a 19" (18" visible")
monitor has a resolution of 71ppi at 1024 x 768. A 17" monitor uses 80ppi at
this resolution. At 1280 x 1024, the figures are 80ppi for a 21" monitor,
88ppi for a 19" monitor, and 100ppi for a 17" monitor. So, only the smallest
of the modern monitor sizes (used at high resolution) results in more than
90ppi.

Laptop computers are now commonplace. A 13" laptop screen with 800 x 600
resultion has both a dpi and ppi figure of 1,000/13 = 77dpi (or ppi). Even
for a 12" x 800 x 600 TFT display, this is just 83dpi. You need 1024 x 768
resolution with a screen size of 14" or less to get to 90dpi.

Now, that's a whole lot of computers that run at less than 90ppi.

Just my two eurocents.

Geoff Lane
Cornwall, UK
geoff -at- gjctech -dot- co -dot- uk


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References:
RE: Nielsen's Rating: From: Arlen . P . Walker

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