I'm currently learning how / writing code to convert spectral data to XYZ color space values, using various color matching functions

One thing often overlooked is that the CIE 1931 2° color matching function is not ideal to match monitors in the first place for several reason:
– When you look at a monitor, the field of view used represents a lot more than 2°
– Further research since 1931 characterized the average eye's spectral response a lot better

Wide gamut displays like OLED, LCDs equipped with quantum dot film or furthermore LCDs with laser backlight can produce color primaries with narrow spectrum.

In case the wavelengths composing these primaries fall where the CIE 1931 XYZ function is not so precise, it turns out color matching between displays of different technologies simply doesn't work anymore. Like way off.

As an illustration, you probably have seen an AMOLED equipped smartphone that was too green despite the manufacturer's effort to calibrate it to D65 white point, and measurements with regular tools and software confirming that; but not your eyes.

This +Sony's whitepaper explain they had the same issue when calibrating their reference OLED displays and the solution they adopted.

That's another reason why I develop my own display analysis software suite.
The mobile industry is extremely fast at adopting the latest display technologies and it requires state of the art research to keep up ­čÖé

#supercurioBlog #calibration #color #development


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Fran├žois Simond

Mobile engineer & analyst specialized in, display, camera color calibration, audio tuning

5 thoughts on “I'm currently learning how / writing code to convert spectral data to XYZ color space values, using various color matching functions”

  1. I'm curious how you find the reference value for this new technologies if the actual calibration "ways" can not be used.
    They are Mathematical/categorical ones where they "deduce" that one thing will be % more or less or is empirical using some neutral reference?

  2. The concept and basis I already understand..
    My question is more if they are using a common base of "sample" to reference or for example, OLED, Quantum DOT each one will have a specific reference for each one.
    The colours still the same from all new technology but the how this technology give us this colour change.. The perception to.

  3. +Friedrich Sinofzik sorry I didn't got the question right.
    A representative color matching function should work for any color composed of any spectum, which means it should work also for emissive light sources like displays regardless of the technology used.

    Today we can observe major differences when trying to match things as common as mobile LCD and AMOLED displays.
    Before knowing all that I suspected my spectrophotometer sensor to have aged badly, but maybe not!
    That's why I'm excited to work with this newer research results, both for calibration and review/analysis.

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