Watermark The watermark is a light image of about 5% density. It is placed behind the text, so that you may write over it. Do not make the watermark too complex, as detail will be lost in a light image.You may have both a letterhead and watermark in one template. If you are using a laser printer, you should have at least 2 megabytes of installed RAM available in your printer. Dot-matrix printers in graphics mode utilize buffers and print line by line.This is not a problem for dot-matrix printers.