You should always keep in mind that the colors on your screen most likely will
not match the colors (exactly) that come out of your printer. Your computer
monitor displays colors in RGB (red, green, blue), while your printer prints out
either in CMYK (cyan, magenta, yellow, black) or PMS (Pantone Matching System)
colors. These are two different color spaces, which is why they display colors
so differently.
While backgrounds that contain images can be pleasing, one should make certain that the background image chosen is not too busy, and does not cause a perceived "confusion" in their visitor's mind. Examples of confusing background images can be those that are bold colors and repeat too often, or those that do not create a consistent pattern when repeated across a page. Background images can also cause page load time to increase, which is very undesirable. In most cases, a solid colored background is considered more professional.
▪Adjacent or harmonizing colors appear next to each other on the color wheel. Harmonizing colors often work well together but if too close in value they can appear washed out or not have enough contrast.
▪Complementary colors are separated by another color on the color wheel. Complementary colors printed side by side can cause visual vibration making them a less than desirable combination. However, separate them on the page with other colors and they can work together.
▪Clashing or contrasting colors are directly opposite each other on the color wheel. Despite the name, colors that clash are not always a bad combination if used carefully. They provide great contrast and high visibility.
