In addition, more advanced computer systems have more advanced abilities in the reproduction of color. Again, these capabilities and the intended audience for your work will determine some aspects of the materials you produce.
Computer devices reproduce images and text with pixels.
When reproducing colors, a number is assigned to a pixel to indicate what color should be shown. When the Mac and PC platforms were developed, this base set of standard 256 colors was different on each platform. The platforms did share around 216 colors, but others in the set were different. So, an image that looked fine on one machine would appear different on the other. With a palette of 256 colors, the range of material that could be reproduced was fairly limited.