Simulating color tile on ColorChecker card

Question

I would like to simulate the reflected light from a ColorChecker tile (or even build an entire card) and use different illuminants in the system using the standard options for the Source Color (under Color/Spectrum) using different XYZ Tristimulus Values for different white points.

I have reflectance spectrum using a spectrophotometer which uses D65 illuminant

How you make a surface with a custom reflectance spectrum ?
Do I need to make transform my spectrum for each different illuminant I want to try?

Is this even something that can … should be done in Zemax? maybe that should be the first question

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Best answer by Sandrine Auriol 26 July 2022, 11:16

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Sandrine Auriol · Accepted Answer

Your result will change with the source because of the source spectrum.

I think you don’t need to change the reflection vs wavelength for each source. If it was measured with a spectrometer, then a blank was taken before each measure, so the value is a ratio, which is “relatively” independent of the source.

Sandrine Auriol · Answer

Hi JamesYou can define the “custom” reflectance spectrum of a surface using coatings. Open the COATING.DAT file that comes with OpticStudio and search for “TABLE”:Let us know if this helps.

Simulating color tile on ColorChecker card

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