#List Of Postscript Printers Driver Sets The#

List Of Postscript Printers Driver Sets The

At the start of the print job, it looks up the paper size name (as set in the Configuration window of Printers). The PostScript printer driver sets the output devices page size in the following manner. The mechanisms that reinitialize printer state between jobs may be written in PostScript, but they also may not at least some of the machinery in question is either not in PostScript or uses implementation-specific primitives, such as when to stop listening to just the communication channel handling the current job and return to listening for.

PostScript can be used by a wide variety of computers and printers and is the dominant format used for desktop publishing.Warnock left with Chuck Geschke and founded Adobe Systems in December 1982. This work later evolved and expanded into the Interpress language.CORRESPONDING PRODUCTS LIST. In 1978 John Gaffney and Martin Newell then at Xerox PARC wrote J & M or JaM (for 'John and Martin') which was used for VLSI design and the investigation of type and graphics printing. The custom printer description file enables a computers printing system to insert, into a print data stream, commands (e.g., PCL, PJL, JCL, JDF, or PJTF commands) that cause a non-Postscript-enabled printing device (e.g., a non-Postscript printer) to perform operations in accordance with a users specified. But Press, a data format rather than a language, lacked flexibility, and PARC mounted the Interpress effort to create a successor.A method for automatically generating a custom printer description file is disclosed.

The LaserWriter used a 12В MHz Motorola 68000, making it faster than any of the Macintosh computers to which it attached. This required high performance microprocessors and ample memory. For a time an interpreter (sometimes referred to as a RIP for Raster Image Processor) for the PostScript language was a common component of laser printers, into the 1990s.However, the cost of implementation was high computers output raw PS code that would be interpreted by the printer into a raster image at the printer's natural resolution. The combination of technical merits and widespread availability made PostScript a language of choice for graphical output for printing applications. At about this time they were visited by Steve Jobs, who urged them to adapt PostScript to be used as the language for driving laser printers.In March 1985, the Apple LaserWriter was the first printer to ship with PostScript, sparking the desktop publishing (DTP) revolution in the mid-1980s.

The characters on these systems were drawn as a series of dots, as defined by a font table inside the printer. There were a number of technologies for this task, but most shared the property that the glyphs were physically difficult to change, as they were stamped onto typewriter keys, bands of metal, or optical plates.This changed to some degree with the increasing popularity of dot matrix printers. The suffix Level 1 was added when Level 2 was introduced.PostScript Level 2 was introduced in 1991, and included several improvements: improved speed and reliability, support for in-RIP separations, image decompression (for example, JPEG images could be rendered by a PostScript program), support for composite fonts, and the form mechanism for caching reusable content.PostScript 3 (Adobe dropped the 'level' terminology in favor of simple versioning) came at the end of 1997, and along with many new dictionary-based versions of older operators, introduced better color handling and new filters (which allow in-program compression/decompression, program chunking, and advanced error-handling).PostScript 3 was significant in terms of replacing the existing proprietary color electronic prepress systems, then widely used for magazine production, through the introduction of smooth shading operations with up to 4096 shades of grey (rather than the 256 available in PostScript Level 2), as well as DeviceN, a color space that allowed the addition of additional ink colors (called spot colors) into composite color pages.Use in printing Before PostScript Prior to the introduction of PostScript, printers were designed to print character output given the textвЂ”typically in ASCIIвЂ”as input. By 2001, few lower-end printer models came with support for PostScript, largely due to growing competition from much cheaper non-PostScript ink jet printers, and new software-based methods to render PostScript images on the computer, making them suitable for any printer PDF, a descendant of PostScript, provides one such method, and has largely replaced PostScript as de facto standard for electronic document distribution.On high-end printers, PostScript processors remain common, and their use can dramatically reduce the CPU work involved in printing documents, transferring the work of rendering PostScript images from the computer to the printer.The first version of the PostScript language was released to the market in 1984. But as printer mechanisms fell in price, the cost of implementing PS became too great a fraction of overall printer cost in addition, with desktop computers becoming more powerful, it no longer made sense to offload the rasterisation work onto the resource-constrained printer.

Like plotters, laser printers offer high quality line art, and like dot-matrix printers, they are able to generate pages of text and raster graphics. In addition, they tended to be expensive and slow, and thus rare.Laser printers combine the best features of both printers and plotters. Almost all plotters shared a common command language, HPGL, but were of limited use for anything other than printing graphics. These printer control languages varied from printer to printer, requiring program authors to create numerous drivers.Vector graphics printing was left to special-purpose devices, called plotters. The graphics were interpreted by the computer and sent as a series of dots to the printer using a series of escape sequences.

This program can be sent to an interpreter in a printer, which results in a printed document, or to one inside another application, which will display the document on-screen. Many applications can transform a document into a PostScript program: the execution of which results in the original document. PostScript made it possible to exploit fully these characteristics by offering a single control language that could be used on any brand of printer.PostScript went beyond the typical printer control language and was a complete programming language of its own.

PostScript avoided this problem with the inclusion of font hinting, in which additional information is provided in horizontal or vertical bands to help identify the features in each letter that are important for the rasterizer to maintain. A number of typographic issues had to be considered with this approach.One issue is that fonts do not scale linearly at small sizes and features of the glyphs will become proportionally too large or small and start to look displeasing. The font system uses the PS graphics primitives to draw glyphs as curves, which can then be rendered at any resolution. For this reason, PostScript interpreters are occasionally called PostScript raster image processors, or RIPs.Almost as complex as PostScript itself is its handling of fonts. When the PostScript program is interpreted, the interpreter converts these instructions into the dots needed to form the output.

Adobe would then sell licenses to the Type 1 technology to those wanting to add hints to their own fonts. Type 1 was effectively a simplification of the PS system to store outline information only, as opposed to being a complete language (PDF is similar in this regard). It had formerly been believed that hand-tuned bitmap fonts were required for this task.At the time, the technology for including these hints in fonts was carefully guarded, and the hinted fonts were compressed and encrypted into what Adobe called a Type 1 Font (also known as PostScript Type 1 Font, PS1, T1 or Adobe Type 1).

The CFF/Type2 format later became the basis for handling PostScript outlines in OpenType fonts.The CID-keyed font format was also designed, to solve the problems in the OCF/Type 0 fonts, for addressing the complex Asian-language ( CJK) encoding and very large character set issues. Type 3 fonts allowed for all the sophistication of the PostScript language, but without the standardized approach to hinting.The Type 2 font format was designed to be used with Compact Font Format (CFF) charstrings, and was implemented to reduce the overall font file size.