On the Callas blog an article has appeared, in which the managing director Dietrich von Seggern reviews the development of Callas and the PDF technology.
In his first article Martin Bailey, CTO of Global Graphics, discussed the basics for calculating the required data rate of a RIP, the second article deals with the selection of the class of the Raster Image Processor (RIP):
- Up to 250 MB/s: a single RIP with multi-threading is sufficent.
- Up to 1 GB/s: multiple RIPs should be used on a single server.
- Above 1 GB/s: multiple RIPs distributed over multiple servers are required.
The articles are primarily aimed at manufacturers of output systems (digital printing, CTP). However, it is also interesting for users who wish to learn more about the architecture of RIPs.
In addition to the article What does a RIP do? Global Graphics has published an article on calculating the size of the required data rate of a RIP. This is the first part of a two part series on Choosing the class of your Raster Image Processor (RIP).
The article links to an Excel spreadsheet with several calculation formulas for sheetfed and web printing. The formula for sheet-fed printing can also be used to calculate the amount of data for a platesetter.
The Callas Blog has published an article about the necessity of «context aware” preflight. The new «Sifter» technology in Callas pdfToolbox 10 allows to analyze PDF objects in their context. See also my article A Quantum Leap in Preflight!.
Akash Choudhary describes some use cases in his post. The classic example is certainly small black text that is set to knockout:
If the black text is places over a colored background (left), overprinting is important to prevent white flashes in case of register inaccuracies in the printing machine. If the text has no background (right), it does not matter whether it is set to overprint or knockout.