PostScript Level 3 was introduced
earlier last year and is in the processing of being incorporated into device
Some new features of PostScript
Level 3 include
- Smooth shading - Smooth transitions
from lighter to darker. Reduced banding. Both look better and print faster.
- Masked Images -Easier to print complex
masks (clipping paths)
- In-RIP separations - More accurate
higher quality color.
- Hi-Fi color - Supports separations
with more than 4 colors, e.g. Pantone Hexachrome.
- Superscreens - Extra grays. Increases
the number of gray levels printed on desktop printer.
- In-RIP trapping - More reliable trapping.
- Faster page processing - Prints faster
- Direct support of PDF (Adobe Acrobat
Portable Document Format)
- Don’t have to open Acrobat viewer
to print, can send direct to printer.
- Built in Web tools - Better equiped
to work with network files.
Acrobat - A dialect of PostScript designed
to extend device independence to full portability between platforms.
A file is encoded as a PDF
(Portable Document Format) with the Acrobat Distiller and is interpreted by
the Acrobat Reader. Principle differences between Acrobat and PostScript is
- Acrobat does not contain the full
set of PostScript Operators.
- Acrobat can discard some high resolution
data on a page to produce a more compact file.
- No device specific information is
referenced in the file.
Acrobat 2.0 allows optional
retention of PostScript information so that it can be regenerated. Acrobat
3.0 was introduced last year. Some new features are
- It is Web Ready. Acrobat 3.0 offers
integrated viewing of PDF documents directly within World Wide Web browsers.
- Page-on-Demand. Access Page at a time
downloading of PDF files across the Internet ensures fast display of PDF
- Progressive Rendering of PDF pages
means that text is rendered first (using a substitute font if necessary),
followed by hypertext links and images. Then any embedded fonts are drawn
on-screen last, ensuring quick viewing of the information.
- Optimize Files for the Internet. The
Save As option of Acrobat 3.0 now includes a checkbox for optimizing
- PDF files for on-line delivery. Duplicate
background objects (text, line art, and images) are combined, which can
significantly reduce file size.
- Objects in a PDF file are re-ordered
for page-on-demand access over the net.
- Batch Optimize.
- Users can easily optimize an entire
folder—and, optionally, all included subfolders—of PDF files on a
Web server or CD-ROM staging area.
- Cross-Document Links and the Internet
PDF documents with relative cross-document links now work unchanged.
- This means users can create a single
collection of hypertext-linked PDF files and publish them on local drives,
network drives, CD-ROM, or a Web server—and the links automatically work
in all locations.