First off all thank you for creating this program and providing video guides that are exremely helpful.
I bought the color passport 2 utilize the MicaToolbox as easily as possible. In your video \”How to create a cone catch mapping function…\” you use the white square as the 91% reflectance grey scale. How did you determine that value? Did you also have the reflectance value of the other grey scale squares of the color checker classic?
As I understand the color checker classic was not designed to be used as a reflectance grey scale. This is why the newer color checker passport 2 includes a 18% reflectance grey scale. The manufacturer does not provide these kind of reflectance values for the color checker classic. But I would prefer to use the color checker classic in my pictures because it includes a scale and is the right size for my specimen. So knowing your reasoning and other reflectance values would be very much appreciated.
Thank you for your time,
Hannes
Hi,
These reflectance values would be obtained using a spectrophotometer. Alternatively, the correct value for each channel (R,G,B) can be determined by generating an .mspec of your chart next to a known grey standard.
Cheers,
Cedric