Re: Contrast
Re: Contrast
- Subject: Re: Contrast
- From: Roger Breton <email@hidden>
- Date: Wed, 11 May 2005 12:28:03 -0400
> 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.
Super insight! Thank's so much for sharing it. Makes a lot of intuitive
sense. And is easy to corroborate by anyone.
> 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.
So, you're saying that in order to do the utmost critical observation on a
display, in order to fully appreciate the 'digital' dynamic range present in
an image, almost or very close to total darkness is practically the only
condition in which our eyes can fully perceive those very dark details. It's
interesting to note that on a print, it's quite the opposive,
physiologically: in order to help our visual system fully appreciate the
last ounce of detail in the shadows of a print we need lot's of
illumination, hence the ISO-3664 P1 of 2000 Lux level.
> Mark Rice
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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| References: | |
| | >Contrast (From: "Mark Rice" <email@hidden>) |