Colour calibration for monitor is vital, If you want to be confident that the pictures you are editing on the screen appear correctly on your finished print. 

Automatically generates ICC input, display, output, and Device Link profiles for color imaging devices. Colour calibration offers high color consistency and predictability for standard color management workflow.

Colour Calibration sets up your screen brightness and contrast for the best viewing of images on your display. It is a requirement for all devices taking an active part of a color managed workflows. The aim of color calibration is to measure and/or adjust the color response of a device (input or output) to a known state.