For an in-depth explanation see here: Spot & Process Colours Explained
Will the colour(s) I see on a PDF proof print exactly as I see them onscreen?
Generally, no! Some colours are fairly representative whereas others are a long way off. The monitor you view your proof on is a device that mixes colours using red, green and blue (RGB). Without getting too technical, if your monitor has not been calibrated to display a Pantone® colour, then it’s unlikely you will see […]