Why are some RGB colors difficult to match?

Some RGB colors are difficult to match on products printed in CMYK because RGB can display a wider range of colors than CMYK can reproduce.

RGB creates color using light, allowing screens to display especially bright or neon colors. CMYK creates color using ink, so some RGB colors may appear less bright when printed on CMYK products.

The example below shows the difference between RGB artwork displayed on a screen and the printed result.

Related article: Can you print RGB colors?