Perbezaan antara semakan "PostScript"

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'''PostScript''' ('''PS''') is a dynamically typed [[concatenative programming language|concatenative]] [[programming language]] created by [[John Warnock]] and [[Charles Geschke]] in 1982. PostScript is best known for its use as a [[page description language]] in the electronic and [[desktop publishing]] areas.
== HistorySejarah ==
The concepts of the PostScript language were seeded in 1976 when [[John Warnock]] was working at [[Evans & Sutherland]], a famous [[computer graphics]] company. At that time John Warnock was developing an interpreter for a large three-dimensional graphics database of [[New York]] harbor. Warnock conceived the [[Design System]] language to process the graphics.
Once the ''[[de facto]]'' standard for electronic distribution of final documents meant for publication, PostScript is steadily being supplanted in this area by one of its own descendants, the Portable Document Format or [[Portable Document Format|PDF]]. By 2001 there were fewer printer models which came with support for PostScript, largely due to the 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 provided one such method). The use of a PostScript laser printer still can, however, significantly reduce the CPU workload involved in printing documents, transferring the work of rendering PostScript images from the computer to the printer. PS is still an option on most "high end" models.
===PostScript Level 1===
The PostScript language has had two major upgrades. The first version, known as PostScript Level 1, was introduced in 1984.
===PostScript Level 2===
PostScript Level 2 was introduced in 1991, and included several improvements: improved speed and reliability, support for in-RIP separations, [[Image compression|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===
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 2), as well as DeviceN, a color space that allowed the addition of additional ink colors (called [[spot color]]s) into composite color pages.
== Use in printing ==