Laser Printer Raster Image Processing

This is a simple way to understand how laser printer processing raster image to print.
 
Each accumbent band of dots beyond the folio is accepted as a raster band or browse line. Creating the angel to be printed is done by a Raster Angel Processor (RIP), about congenital into the laser printer. The antecedent actual may be encoded in any cardinal of appropriate folio description languages such as Adobe PostScript (PS, BR-Script), HP Printer Command Accent (PCL), or Microsoft XML Folio Specification (XPS), as able-bodied as unformatted text-only data. The RIP uses the folio description accent to accomplish a bitmap of the final folio in the raster memory.

For absolutely graphical achievement application a folio description language, a minimum of 1 megabyte of anamnesis is bare to abundance an absolute connected letter/A4 sized folio of dots at 300 dpi. At 300 dpi, there are 90,000 dots per aboveboard inch (300 dots per beeline inch). A archetypal 8.5 × 11 breadth of cardboard has 0.25-inch (6.4 mm) margins, abbreviation the printable breadth to 8.0 × 10.5 inches (270 mm), or 84 aboveboard inches. 84 sq/in × 90,000 dots per sq/in = 7,560,000 dots. Meanwhile 1 megabyte = 1,048,576 bytes, or 8,388,608 bits, which is aloof ample abundant to authority the absolute folio at 300 dpi, abrogation about 100 kilobytes to additional for use by the raster angel processor.

In a blush printer, anniversary of the four CYMK toner layers is stored as a abstracted bitmap, and all four layers are about preprocessed afore press begins, so a minimum of 4 megabytes is bare for a full-color letter-size folio at 300 dpi.

Memory requirements access with the aboveboard of the dpi, so 600 dpi requires a minimum of 4 megabytes for monochrome, and 16 megabytes for blush at 600 dpi. Printers able of abridged and beyond admeasurement may accommodate anamnesis amplification slots.