[Openicc] review of new ProPhoto-RGB profile

[Chris Murphy]

On Mar 23, 2012, at 10:13 AM, James Cloos wrote:

>>>>>> "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?

Same curve type as Adobe's ProPhoto RGB. However I'm seeing a difference in primaries and white point. Probably not big differences, but...

Adobe's version of ProPhotoRGB:

      <TagSignature>wtpt</TagSignature>
      <XYZNumber X="0.96420288" Y="1.00000000" Z="0.82489014"/>

      <TagSignature>rXYZ</TagSignature>
      <XYZNumber X="0.79766846" Y="0.28804016" Z="0.00000000"/>
      <TagSignature>gXYZ</TagSignature>
      <XYZNumber X="0.13519287" Y="0.71188354" Z="0.00000000"/>
      <TagSignature>bXYZ</TagSignature>
      <XYZNumber X="0.03134155" Y="0.00009155" Z="0.82490540"/>

Review version of ProPhotoRGB:
      <TagSignature>wtpt</TagSignature>
      <XYZNumber X="0.96429443" Y="1.00000000" Z="0.82510376"/>

      <TagSignature>rXYZ</TagSignature>
      <XYZNumber X="0.79771423" Y="0.28805542" Z="0.00000000"/>
      <TagSignature>gXYZ</TagSignature>
      <XYZNumber X="0.13516235" Y="0.71186829" Z="0.00001526"/>
      <TagSignature>bXYZ</TagSignature>
      <XYZNumber X="0.03132629" Y="0.00007629" Z="0.82489014"/>


Is there correction for flare in these values?


Chris Murphy