Re[2]: CRT monitors cont.
Re[2]: CRT monitors cont.
- Subject: Re[2]: CRT monitors cont.
- From: Peter Karp <email@hidden>
- Date: Tue, 6 Mar 2007 11:54:12 +0100
Hi Liz,
[different panels for 17" and 20" Macs]
> Looked at these specs. Questions:
> It says all the iMacs are made with the same "TFT active-matrix liquid
> crystal display". It doesn't say anything about different materials.
TFT active matrix is the used technology. Like you can (or could) buy
silver halogenide B/W films which use the same core technology there
is a difference between an Agfa APX25 and a Kodak Tri-max film.
> It also says the "typical viewing angle" for a 17" inch is 120 degrees, for
> a 20" 170 degrees.
Yes, that's for the minimum contrast of 10:1 like I described.
> 1) So .... Why is the angle less for a smaller screen, when they're made of
> the same stuff?
> I don't understand.
It's because only the basic technology is the same, but it's definetly
a different panel with different technical specifications.
> Also, the resolutions of the Cinema displays are expressed as things like
> "1920 x 1200". But since the screens are different sizes, this doesn't
> tell you anything about the real resolution unless you sit there with a
> calculator and divide the numbers by the screen width.
That's true. If you don't want to bother with your desktop calculator
you can use a tiny "Display Calibrator"
www.quato.de/software/quatotools.zip
where you put in the pixels and size of the screen diagonal and you'll
get...
> 2) Is the resolution of LCD screens ever expressed in some way that is
> independent of screen size, so that you can compare the res of two screens
> of different sizes? If so, what is it?
...
dot pitch in mm
resolution in dpi
width, height and area in cm
aspect ratio
number of Megapixels
> I didn't think it was gonna cost me over $1000 to get a decent
> color-calibratable monitor, since I was willing to live with a
> smallish screen, not a 24" monster, but it seems that if you don't
> like the angle shift, and you want something not pre-used, then, LCD
> or CRT regardless, >>$1000 is right where you're headed.
17" display are usually low-end and have a bad viewing angle. As a
rule of thumb a display should have 170° or better for the viewing
angle in the specs. But be aware that the colorshift of a display with
spec'd 178° must not be better then a display with 170°. This spec
number gives you only an indication about the real world color shift.
> Bear in mind that all this equipment will be sold off when I finish
> the project, it's not an "investment" except to get me done with
> this book.
Maybe the investment is still worth the money. My wife, who has nothing
to do with color or computers in general, really loves to have the 21"
(1600x1200 resolution) display and she does not want to use a smaller
display ever.
But if you're on a budget you can look for a decent display from NEC,
Eizo and others and buy or lend a display calibration software. This
will already will make a big difference to an uncalibrated screen.
Best regards
Peter
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