[Openicc] review of new ProPhoto-RGB profile

[Max Derhak]

If you have a curve with single entry, the value of the curve/256
defines the gamma.  In this case 461/256  = 1.80078125 or approximately
1.8.

Max Derhak
Senior Software Architect
max.derhak at onyxgfx.com


-----Original Message-----
From: openicc-bounces+max.derhak=onyxgfx.com at lists.freedesktop.org
[mailto:openicc-bounces+max.derhak=onyxgfx.com at lists.freedesktop.org] On
Behalf Of James Cloos
Sent: Friday, March 23, 2012 12:14 PM
To: Open ICC Color Managment
Subject: Re: [Openicc] review of new ProPhoto-RGB profile

>>>>> "KB" == Kai-Uwe Behrmann <ku.b at gmx.de> writes:

KB> find attached a newly created ICC editing profile for review. It was

KB> created with ProPhoto primaries and a gamma of 1.8 like the original

KB> one.

I used iccToXml to take a look at it, and got this fragment:

    <curveType>
      <TagSignature>rTRC</TagSignature>
      <TagSignature>gTRC</TagSignature>
      <TagSignature>bTRC</TagSignature>
      <Curve>
         461
      </Curve>
    </curveType>

The last profile you posted had a 256-element vector there.

Is that a short-cut for a well-known curve?

-JimC
-- 
James Cloos <cloos at jhcloos.com>         OpenPGP: 1024D/ED7DAEA6
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