Basics The content of this page has been moved to the main PostScript page. 30 December 2016 5 Comments » 5 responses to “Basics” Alex says: May 14, 2011 at 2:56 am Thank you! Now I can do some relations: Postscrip level 3, for exemple, it is a progression in the language and PostScript level 3 RIPs mean that RIP can interpret this level of language. The way it make this interpretation, I think it is: or by CPSI (I suppose that it is a cheaper OEM tecnology, than APPE) or by APPE. I worked with Prinergy and saw Normalizer process occur in front of me all the time. After a little research (certainly not something new for the Sr., or as we say here in Brazil: teaching the priest to pray!), CPSI v3015 had some problem with transparency, solved with flattened PDF 1.3, nowadays v3019 without thoses issues. Alex says: May 12, 2011 at 3:40 pm Mr. Laurens, please,could you explain the relation between PostScript 3, CPSI and APPE. I´ve read your texts, but I could not do a clear relation between them. Thank you! Laurens says: May 13, 2011 at 8:55 pm OK, let’s start with the basics: PostScript is a page description language. A PostScript file defines what a page or document looks like. CPSI and APPE are software libraries that Adobe sells to vendors so these can build a RIP (or renderer as it is sometimes called). Such a RIP takes a page description and uses it to output the document, usually on physical media such as paper, film or printing plates. Let me use an analogy: A PostScript file is to an MP3 file as a RIP is to a music application on your computer or the software of your MP3 player. How do CPSI and APPE relate to PostScript: CPSI is the precursor of APPE. It is a PostScript interpreter: you can send a PostScript file to a RIP based on CPSI and it will make sure you get a nice print-out, or a good set of films or plates. APPE was created when Adobe had already phased out PostScript. APPE cannot process PostScript files directly, it expects to be fed PDF files. A lot (or maybe all) of the vendors that build RIPs based on APPE still see the need for supporting PostScript so they typically add a PostScript to PDF convertor (Distiller or Normalizer) to their RIP or workflow. That means you can still send PostScript files to such a system. In the background they will be converted to PDF and then forwarded to the APPE component. Hope this clears things up a bit. Chai says: November 18, 2010 at 1:35 am Hey, Thanks for your excellent article. one question. You wrote: “PostScript can also be used to exchange data between applications themselves and it forms the basis of the PDF file format.” I am not clear about it. Could you clarify? Or can I understand in this way:if I export a PDF from indesign, and I use different PDF viewer to read it, such as Preview, Acrobat or VPS, I may get different display result because they have different RIP built in? So eager to hear from you answer. Thanks Laurens says: December 22, 2010 at 4:29 pm That latter statement unfortunately is true – depending on the viewer application you use a PDF may be displayed differently.