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Colour and Imaging Group Department of Colour Science. Evaluation of Visual Colour Fidelity. Cheng Li Supervisor : Prof. M. Ronnier Luo. Aim. A reliable experimental method for evaluating the colour rendering property between test and reference illuminants Focus on ‘colour fidelity’.

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Colour and Imaging Group

Department of Colour Science

Evaluation of Visual Colour Fidelity

Cheng Li

Supervisor : Prof. M. Ronnier Luo


Aim

  • A reliable experimental method for evaluating the colour rendering property between test and reference illuminants

  • Focus on ‘colour fidelity’




Viewing Cabinets

  • 9 observers and each repeated twice


Experimental Procedure

Task:

To scale the visual colour difference of test samples viewed under one of the test simulators and then under thereference lamp

  • Steps:

  • Observers were first asked to adapt to the test source for 15 seconds and remember the colour of a randomly selected sample;

  • Observers were adapted under the reference lamp for another 15 seconds;

  • After re-adaptation under the reference source, the test sample was shown again, and the observers were asked to estimate the colour difference between the colour seen under the reference lamp and that memorised colour by using the grey scale method

  • Note:If observers could not memorise the colour previously seen under the test simulator, they were allowed to see the test sample again, but 15 seconds adaptation time under both test source and reference lamp had to be applied.



Effect of colour difference equations

CV values for different colour difference calculation methods for each simulator


Results

CV values for different colour difference calculation methods for all simulators


r=0.8641

r=0.9203

Results:

Less scatter for CAM02-UCS than current CRI


CRI-CAM02UCS

CRI-CAM02UCS

Colour differences of 14 reflective samples are calculated in the CAM02-UCS uniform colour space

The CRI-CAM02UCS is re-scaled to keep consistence with the original CIE CRI



Colour and Imaging Group

Department of Colour Science

Thank you


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