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List:       freedesktop-openicc
Subject:    Re: [Openicc] Questions about color pickers and graphics libraries
From:       Bob Friesenhahn <bfriesen () simple ! dallas ! tx ! us>
Date:       2008-02-14 6:13:01
Message-ID: Pine.SOC.4.64.0802140008430.1000 () freddy ! simplesystems ! org
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On Wed, 13 Feb 2008, Chris Murphy wrote:
>
> First it's not very clear at what dynamic range or contrast ratio something 
> is HDR. I don't know if there is a spec somewhere that defines these things, 
> but I haven't come across that yet.

HDR is clearly beyond the range of human vision, and the parameters of 
that were determined back in the 1930s.

> 60:000:1 contrast ratio? That's not just wide contrast ratio. That's HDR.

Human vision supports something like 30,000:1 but not in one scene. 
Regardless, proper HDR formats support many orders of magnitude beyond 
that.

It seems that the marketeers have taken charge of terminology, similar 
to elsewhere.

Bob
======================================
Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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