When inserting a handwritten signature into Excel 2010, scanning a picture and printing it, the font appears in dotted form. The main reason is that the picture and printing resolution are too low. To improve this situation, we need to adjust these two parameters.

Improving image resolution is key. Specifically: For photo paper printing, a resolution of 72 pixels is recommended. Inkjet printing can be reduced to 30 pixels. Photo paper printing requires 300 pixels for clarity. The ideal resolution for laser printing is 150dpi, which is sufficient for most text needs. The optimal resolution for color inkjet printing and printing is 200dpi.

It is worth noting that although the conventional resolution of laser printers is 600×600dpi, not all printing requires the highest precision. In a modern office environment with diverse document types, images and graphics may require higher resolutions, such as 1200dpi or higher, to ensure rich color gradations and smooth transitions. Therefore, when choosing a printer, in addition to considering print speed and load, you also need to ensure that the print quality can meet your specific image and photo needs.