I have not found a CD with my DELL screen. I have set the screen to 6500 K in the OSD menu. Windows 10 includes the programme dccw, which creates a colour profile for the respective monitor. In addition, various test images are offered for calibration. Everything worked for me except for the gamma value, which I could not set optimally in the programme. (There is no option for the gamma setting in the OSD) I use the DELL monitor as a second monitor next to an EIZO with colour calibration and am satisfied with the colour representation of the DELL monitor.