Contrast
Contrast
- Subject: Contrast
- From: "Mark Rice" <email@hidden>
- Date: Wed, 11 May 2005 12:22:02 -0400
- Organization: Zero One
In general, more contrast is better. But because the response of the eye is
exponential, it may be difficult to distinguish between 400:1 and 1000:1 -
they may appear nearly identical.
However, quoting contrast numbers is really kind of like talking about
horsepower in cars - what does it really mean?
I have found that the most critical issue is one that is not quoted in specs
- what is the contrast ration at the highest brightness level the display
can sustain.
For example, if I try to achieve a high brightness value on my LCD monitor,
the black level degrades very strongly, and thus the contrast ration goes
down. By experimenting a lot, I have found that I can achieve about 91 C/sq.
meter and still maintain good blacks. The monitor can achieve up to 121
C/sq. meter, but contrast becomes poor, and shadows become very blue.
Another issue - a conventional transparency or slide has a contrast ration
of about 1000:1. But if you create a gray scale that goes down into the last
two f stops of range in the transparency, they will be nearly impossible to
distinguish without viewing the transparency in a completely dark room.
Bear in mind that a 1000:1 contrast range is only 1 f stop different than a
500:1 contrast range.
Mark Rice
email@hidden
www.zero1inc.com
Message: 2
Date: Wed, 11 May 2005 12:13:05 +1000
From: David Harradine <email@hidden>
Subject: Contrast Ratio
To: Colour Sync List <email@hidden>
Message-ID: <BEA7A751.4B71Úemail@hidden>
Content-Type: text/plain; charset="US-ASCII"
I realise the $64,000 question is what LCD should I buy if I can't afford a
CG-220, so I won't ask it. However, my question is, what role does contrast
ratio play on an LCD monitor.
In theory I would have thought the greater the contrast ratio the better.
However, looking at the Eizo range it seems to be quite the reverse, with
the top of the line CG-220 weighing in at 400:1 and bottom of the line L768K
claiming a confusing 1000:1.
By confusing I mean 1000:1 would seem to be a good thing, but it's the
lowest end model of the range.
Can someone please explain A: the role of and B: the optimal, contrast ratio
of an LCD monitor. All I can find about it on line is in relation to data
projectors, where the rule of thumb seems to be more is better.
Thanks,
David Harradine
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden