The goal of this project is to reverse engineer the USB protocol used to talk to ColorVision’s Spyder colorimeter. ColorVision sells a device for ~$80 that is supposed to calibrate your monitor. It has worked well for me, but it does not work in Linux. Once the protocol is decoded, I plan to write a Linux device driver so I can use the colorimeter in Linux. As far as I know, there is no one else attempting this right now. I welcome all help from anyone who has expertise in Linux USB drivers or monitor calibration.