Printers have their own character set, which allows the print to the printer with a low amount of data to transfer. Common today, however, are connected via USB as a bitmap pixel by pixel transferred large amounts of data no problem, so that signs and graphics can be converted both already in the printer driver of the controlling PC to a bitmap. This allows the much more extensive use of the fonts installed on the PC software. HP 2711x
For determining the positions at which the individual droplets are sprayed onto the paper, a raster image processor is used, which means among other things Dithering and color separations (for color printers), the pixels of an image to be printed in block cells converts (Dithercells, or in grayscale "halftone"), ie groups of dots of ink in the print image, which by superposition and composition of the droplets in terms of number, color, possibly size and arrangement of the color and brightness of the pixels reflect as accurately as possible. The reach of a printer, actual resolution of pixels (eg, as determined ppi points per inch) thus depends on the positioning resolution of the individual droplets (eg, as dpi, dots per inch, as indicated) and the magnitude of the pressure cells from. For example, a printer with a nominal resolution of 5000 dpi at a pressure cell size of 5x5 pixels printing the original resolution of the pixels 1000 ppi. The so-called dithering with error diffusion no Dithercells be formed, but analyzes the image line by line and for each point a quantization error is calculated, which is distributed to neighboring pixels. The processes by which the conversion of images in ink droplet pattern on the medium occurs, contributes significantly to the quality of printing and is part of the specific know-how of the printer manufacturer.