No device in the digital photographic workflow can reproduce the full range of colors viewable to the human eye. Each device operates within a specific color space, which simply describes a range, or gamut, of colors that the device can record, store, edit, or output. Some color spaces are bigger than others. For example, the CIE Lab space is large; the sRGB space, used by many web browsers, is relatively small.
In addition, each device describes color either additively, using the RGB color model, or subtractively, using the CMYK color model. RGB is used by cameras and monitors; printers use CMYK.