GoKawiilApple CMF 2026
Apple has recently released their new Studio Display and Studio Display XDR , two 27-inch 5K Retina displays available with their signature $400 stands. We'll cover some display and colour measurements below, but a notable release alongside these displays is the new " Apple CMF 2026 ".
Unless you're really into displays and colour, or need accurate displays for your job, then you likely don't know what "Apple CMF 2026" is or why it matters. We'll cover the basics of the concept here while keeping it high level, as well as linking out to some very technical and 'from the bottom up' resources. We also have our test results from performing luminance and colour testing on the displays.
What is a CMF?
A CMF is plural, standing for 'Colour Matching Functions'. It is a set of mathematical functions that represent how the human eye perceives the colour of visible light. The first CMF was the CIE 1931 CMF , developed experimentally in 1931 by showing a collection of people different sets of colours, and asking them to adjust the input colour components until the final results 'match'. Like balancing a scale, but with colours.
The goal is to create a set of functions that can take the 'raw' input data of a light/colour sensor pointed at a display and calculate values to represent how a human will perceive it. In theory, if the numbers output by the measurements(and CMF) of the displays match, then humans looking at the displays will also say that they match. If the functions don't properly model the response of the human eye, then measurements of two displays could generate matching output numbers, but actual humans viewing the displays will experience mismatched colours.
Why are there multiple CMFs?
Despite the CIE 1931 CMF showing some serious staying power nearly a century later, there have been modifications and revisions released for this CMF(like the Judd Modifications), as well as introductions of entirely new CMFs(CIE 170-2 2015 CMF). These have stemmed from people comparing two displays that have been calibrated using a previous CMF, but finding that they still look slightly different. This suggests that the CMF used isn't accurately modeling how humans are perceiving the colours.
The main target of CMF improvement haas been more correctly modeling how the human eye perceives 'narrow-band sources' like can be found in modern LED, OLED, and Quantum Dot displays. These narrow-band sources produce a different profile of light and colours than previous display technologies. This can expose weak points and inaccuracies in the models. Hence the need for new CMFs.
There has been debate about whether or not some of these newer CMFs are actually better, or better enough to warrant the entire world of calibration and measurement to switch from the ubiquitous CIE 1931 CMF. The main goal of calibration is to standardize the colours and light that everyone is seeing, so having multiple 'conflicting' standards is counterproductive.
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