Resolution should be set to 300 dpi. Pictures and graphics pulled from the internet are often low resolution, typically 72 dpi or 96 dpi. Avoid these graphics, as they will appear pixilated and blocky when printed.

In printing terms, a proof is a one-off copy of your document after all modifications and printing setup processes have been completed. It is your last and best opportunity to make sure that the print job comes out the way you want. By carefully inspecting the proof, you can help us assure an accurate, flawless delivery of your print job on the first run.

In short, printers and monitors produce colors in different ways.

Monitors use the RGB (red, green, blue) color model, which usually supports a wider spectrum of colors. Printers use the CMYK (cyan, magenta, yellow, black) color model, which can reproduce most—but not all—of the colors in the RGB color model. Depending on the equipment used, CMYK generally matches 85–90% of the colors in the RGB model.

When a color is selected from the RGB model that is out of the range of the CMYK model, the application chooses what it thinks is the closest color that will match. Programs like Adobe Photoshop will allow you to choose which color will be replaced. Others may not.