A stationary array of LEDs is used instead of numerous moving parts, and the LEDs are selectively beamed onto the drum. Now, other devices such as removable storage drives, scanners etc. are also connected to the printer parallel port using a 'pass through' mechanism. PCL has become a de facto standard for laser and ink jet printers and is supported by virtually all printer manufacturers who indicate it as 'HP compatible' or 'LaserJet compatible'. Both PostScript and modern versions of PCL are object-oriented, describing a page in terms of geometrical objects such as lines, arcs, and circles. Pigment inks are made up of tiny chunks of solid pigments suspended in a liquid solution.
Conventional inks are essentially oil-based dyes.
Pigment inks offer richer, deeper colours and have less tendency to run, bleed or feather. A page description language developed by Adobe, generally used by laser printers. PostScript is becoming increasingly common in high-end inkjets. The process of translating high-level print commands into a raster image. A raster image with a finer grid contains more dots and has a higher resolution, capable of reproducing more detail in an image.