What is a raster picture processor?

Raster Image Processor (RIP) is a piece of printing system that creates a raster image or bitmap before sending an image to the printing printer. Usually, the inputs that receive a raster image receives are digital vector information that is coded in the form of a high -level description language (PDL) such as XPS, PostScript or a portable document format (PDF). However, RPI input processes may be another bitmap. In this case, RPI applies algorithms of smoothing and interpolation before creating the final output bitmap or raster. However, some printers boast firmware or reserved units for processing hardware images that perform their raster processing on the printer itself. In previous years, the raster processor of the images was a piece of hardware, which received the input data of the Virozhrani A, which then "masked" the image by allowing or deactivating the pixels of the device on which the image was to be created. These are: interpretation, rendering and SCReening, with the first two phases often perform a raster image processor in parallel.

The process of interpretation of the process includes translation of the description language to represent this page. This is done on the page, so after processing each page to be printed, the page is discarded and ready for the next page. The rendering transforms the representation set during the interpretation phase on the tone bitmap. The stage just before printing is the screening process, where the bitmapa continuous tone is converted into a dot formula, semiotone. The raster image processor usually performs one of the two standard types of screening. These methods of screening are amplitude modulation (AM) and frequency modulation (FM). In the former screening method, the sizes of dots differ and are arranged in a solid frame. While in FM screening, the sizes of dots are constant sizes and are arranged randomly to makeThey created areas of darkness and lightness.