Inkjet CD printers spray very small, precise amounts (usually a few picolitres) of ink onto the media. For color applications including photo printing, inkjet methods are dominant. Inkjet CD DVD printers or Thermal CD DVD printers are one of the most commonly used printers. The dots formed are the size of tiny pixels. Inkjet printers can print high quality text and graphics. They are also almost silent in operation. They are cheaper than laser printers, but are expensive to run as their cartridges need to be frequently replaced; Thermal printers produce a printed image by selectively heating coated thermochromic paper when the paper passes over the thermal print head. The coating turns black in the areas where it is heated, producing an image. Two-color direct thermal printers are capable of printing both black and an additional color (often red), by applying heat at two different temperatures.