Learning Centers

RGB versus CMYK

June 30, 2004

Advertisement
Advertisement
 

Editor's Note: This article is part of the PDF Color Learning Center

If you are preparing documents solely for the web, then for the same number of image samples RGB is negligibly faster with possibly smaller file size. If you are preparing documents for print, then CMYK is better since it preserves spot colors, and separating RGB may be unsatisfying or not possible. If you are preparing documents for both web and print CMYK is the better choice. CMYK documents coexist quite nicely in the RGB world, but the converse does not always hold true. And there are ways to convert high-resolution PDF images into low-res for the web.

There are cases though where you can’t always choose CMYK. Many PDF documents originally created using Microsoft or other PC applications will arrive in your shop as RGB. Your choices are basically two: 1) immediately convert them to CMYK, using any of several 3rd party tools for Acrobat, or 2) rely on downstream processes, such as in-RIP separations, to convert RGB to CMYK.

Monitors, scanners, digital cameras, etc. deal in visible light. The color spaces to express these (RGB or various ICC color spaces) are designed to include all visible light. Printing, on the other hand, deals in light reflected off or through inks, which allow a narrower color range, or color gamut. An on-going issue is how are more visible colors converted into the fewer colors of the CMYK print gamut. See the Rendering Intent table above for more on this subject.

PDF In-Depth Free Product Trials Ubiquitous PDF

Debenu Quick PDF Library

Get products to market faster with this amazing PDF developer SDK. Over 900 functions and an equally...

Download free demo

Two Passwords Are Better Than One: The Low-Down On PDF Security

For people who don't spend their time looking at PDF files in text editors*, PDF security is a sometimes misunderstood beast.

For example, those document restrictions that PDF files sometimes have -- no Printing, Content Copying, Page Extraction, etc -- are essentially useless unless the PDF also has a User Password.

January 09, 2014
Platinum Sponsor



Search Planet PDF
more searching options...
Planet PDF Newsletter
Most Popular Articles
Featured Product

Debenu PDF Aerialist 11

The ultimate plug-in for Adobe Acrobat. Advanced splitting, merging, stamping, bookmarking, and link control. Take Acrobat to the next level.

Features

Adding a PDF Stamp Comment

OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.