[argyllcms] Re: Spectral illuminant sample

  • From: "Marco N." <manold@xxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Sat, 16 Feb 2008 21:24:42 +0100

I have controlled the . sp file in the ref folder and It is true, the .sp file is normalized. Why this stuff? 


I have to investigate my conversion.

Thank you again
Marco




Il giorno 16/feb/08, alle ore 21:08, Roger Breton ha scritto:


Marco,

You have the spectrum values in the CXF file :


<Spectrum Conditions="1">

              <Created>2006-09-06/10:15:32</Created>
              <Modified>2006-09-06/10:15:32</Modified>
              <Value Name="380">0.0549282</Value>
              <Value Name="390">0.0581962</Value>
              <Value Name="400">0.0609521</Value>
              <Value Name="410">0.0622062</Value>
              <Value Name="420">0.0620531</Value>
              <Value Name="430">0.061716</Value>

...

             <Value Name="560">0.0900136</Value>

...

              <Value Name="710">0.191601</Value>
              <Value Name="720">0.200459</Value>
              <Value Name="730">0.213745</Value>
I think you have to make sure the values are normalized to 100 at 560nm. In the example above, the value at 560 is 0.0900136. What would you multiply this value to yield 100? Answer = 100/0.0900136 = 1110.943235. So, every 
value in the CXF spectrum has to be 'scaled' by 1110 so that they are
expressed on a 100 scale. I think this is what Argyll is using.

Try that.

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