Currently, a single standard matrix is used for color correcting with Macbeth chart-style color cards (the "classic", "passport", "nano", "mini", and "cameratrax" options for color_chip_size in pcv.transform.detect_color_card), and the reference matrix are based on data from X-Rite in 2009 (rebranded to Calibrite in 2021). In 2014, the pigment formulations on Classic and semigloss (SG) color cards was changed. Additionally, CameraTrax cards seem to use a different set of sRGB values than Calibrite/X-Rite does (a higher resolution photo with the printed sRGB values can be found here).
It probably doesn't make a huge difference for someone working through their own set of images, as long as they use the same color card for all of them. But for standardizing across larger compiled data sets, it would be prudent to update the current standard matrix to use post-2014 values while leaving an option to use the pre-2014 values, as well as adding a new standard matrix for CameraTrax cards.
Currently, a single standard matrix is used for color correcting with Macbeth chart-style color cards (the "classic", "passport", "nano", "mini", and "cameratrax" options for
color_chip_sizeinpcv.transform.detect_color_card), and the reference matrix are based on data from X-Rite in 2009 (rebranded to Calibrite in 2021). In 2014, the pigment formulations on Classic and semigloss (SG) color cards was changed. Additionally, CameraTrax cards seem to use a different set of sRGB values than Calibrite/X-Rite does (a higher resolution photo with the printed sRGB values can be found here).It probably doesn't make a huge difference for someone working through their own set of images, as long as they use the same color card for all of them. But for standardizing across larger compiled data sets, it would be prudent to update the current standard matrix to use post-2014 values while leaving an option to use the pre-2014 values, as well as adding a new standard matrix for CameraTrax cards.