Well, you know some businesses are very sensitive to colours. The one I work in – decorative surfaces – is ALL ABOUT COLOURS. In this industry it is critical to get a brochure printed with colours that are as close to the original as possible, so getting the colour swatches right is just one big task 🙂
While some changes can be obtained via the printing process and printer settings, some colours you won’t get until you correct them in graphic design software.
It’s all about patience and good relationships with your printer 🙂