Not all colours are built the same: CMYK v RGB v PMS
In an ideal world, red would be red, blue would be blue and green would be green. Often, when we’re designing, the ask is “make it blue and yellow”; which seems simple enough, but the truth is there’s thousands of options of blue or yellow. I’m not just talking light blue vs. dark blue, I’m talking CMYK, RGB and Pantone values and the seemingly unending options they each hold.
It’s important to understand the difference between these colour modes and when to use each.