I have to Color calibrate my monitor. I did the gamma correction, but now I need to do the color calibration. There’s no semi automatic option for color calibration. There’s only the option of using a PR 650 which cost over $7000.
There are other devices that cost under $200 (e.g. Datacolor Spyder5 Express USB Colorimeter). I would be happy to use one of these other devices if somebody could walk me through the process. I know there’s a conversion (sorry I forgot DKR to RGB?) But I don’t know things like how many wavelength are necessary.) I’d be happy to spend $200, but I can’t spend $7000. Besides The PR 650 is not made any longer. There’s a PR 655. Someone someone must’ve used one of these less expensive Color Spectralradiometers to calibrate their monitor. If anyone has one of these less expensive devices, and a bit of code I would need, I will save about $7000. Thank you.
I am super interested in this too. I have a lux-meter. I can generate a linearisation LUT for all three channels and greyscreen if needed. I just want to know how one stores these LUTs such that psychopy can use them. Any clues ?
Cheers
Where are you. You can email me directly. I told a member of the lab I visit (I’m retired) that I would send her all the information that I learned on color. I’ll send it to you both but it’s going to be a little bit at a time. I’ve been somewhat sick, it happens when you’re 76 years old. Lots of things put me in pain so it’s hard to concentrate. But I’ll do what I can, somewhat slowly over many email messages.
I used an older model Spyder5pro on my Macintosh computer many operating systems ago. It made the corrections automatically to turn it into Standard RGB. I don’t recall where it was in system settings, but that’s changed so much that it wouldn’t matter anyway. It put the date of the correction measurements which was useful because sometimes you want to take measurements before and after an experiment.
(I promised Lab may named Haley I would give her the meter but my backs been out so I haven’t been able to look for it.) Then you need to change RGB to change RGB to Lch. And back again. This is remarkably easy in PsychoPy with a couple of hidden procedures. They’re not obvious and they’re not listed. I’m going to include my last program that I wrote. I’ll give you more information later. To run the program you have to figure out what monitor settings are used. It was a larger than standard monitor. Also python changed a few commands like the print command. I don’t think I fixed all of those so I couldn’t go to program to run but maybe you can. I’ll send you more information later but I have some other things I have to do for my own health now. You have to figure out the monitor settings that I used. And you have to fix all the stupid little trivial changes they made to Python. I am still using OSX12. But I’ll send you more information later. It took me six months to figure out how to convert fromRGB to LCH, but then it turns out there’s one command hidden away in PsychoPy that does all the hard work for you. More later but I have to take care of some of my only health needs now.
Bill Prinzmetal 
(UC Berkeley), retired
billprinzmetal@gmail.com
(510)685-8623
Forgot program:
(Attachment Occlusion2 compressed.zip is missing)