pctechguide.com

  • Home
  • Guides
  • Tutorials
  • Articles
  • Reviews
  • Glossary
  • Contact

Color Scanners

Colour scanners have three light sources, one for each of red, green and blue primary. Some scanning heads contain a single fluorescent tube with three filtered CCDs, while others have three coloured tubes and a single CCD. The former produce the entire colour image in a single pass, the target being illuminated by the three rapidly changing lights, while the latter have to go back-and-forth three times.

Single-pass scanners have problems with the stability of light levels when they’re being turned on and off rapidly. Older three-pass scanners used to suffer from registration problems along with being slow. More modern three-pass units are much improved and able to match some single-passers for speed. However, by the late 1990s most colour scanners were single-pass devices.

These scanners use one of two methods for reading light values: beam splitter or coated CCDs. When a beam splitter is used, light passes through a prism and separates into the three primary scanning colours, which are each read by a different CCD. This is generally considered the best way to process reflected light, but to bring down costs many manufacturers use three CCDs, each of which is coated with a film so that it reads only one of the primary scanning colours from an unsplit beam. While technically not as accurate, this second method usually produces results that are difficult to distinguish from those of a scanner with a beam splitter.

  • Scanner Operation
  • PMT Scanners
  • CCD Scanners
  • CIS Scanners
  • Scan Resolution
  • Scanner Interpolation
  • Color Scanners
  • Bit-Depth Printers
  • Dynamic Range Scanners
  • Scan Modes
  • Scanner File Formats
  • TWAIN Drivers
  • Color Calibration
  • OCR Technology
  • Photo Retouching

Filed Under: Scanners

Latest Articles

Number Systems 3

The basic unit of computer storage is the eight bit byte, which can store values in the decimal range 0 to 255. The problem when dealing with numbers in binary format is that they quickly become very long. For instance, the number 317 is represented as: 0b100111101, which is bad enough, … [Read More...]

Windows Defence Counsel

Windows Defence Counsel If you've found this page, very likely you've been infected with Windows Defence Counsel. You must be wondering how something that can't even manage to spell defense correctly can cause so much trouble, we're right there with you. Generally speaking, Windows Defence Counsel … [Read More...]

QIC Mammoth

The quarter-inch-tape cartridge (QIC) was first introduced in 1972 by the 3M company as a means to store data from telecommunications and data acquisition applications. As time passed, the comparative inexpensive QIC drive became an accepted … [Read More...]

Gaming Laptop Security Guide: Protecting Your High-End Hardware Investment in 2025

Since Jacob took over PC Tech Guide, we’ve looked at how tech intersects with personal well-being and digital safety. Gaming laptops are now … [Read More...]

20 Cool Creative Commons Photographs About the Future of AI

AI technology is starting to have a huge impact on our lives. The market value for AI is estimated to have been worth $279.22 billion in 2024 and it … [Read More...]

13 Impressive Stats on the Future of AI

AI technology is starting to become much more important in our everyday lives. Many businesses are using it as well. While he has created a lot of … [Read More...]

Graphic Designers on Reddit Share their Views of AI

There are clearly a lot of positive things about AI. However, it is not a good thing for everyone. One of the things that many people are worried … [Read More...]

Redditors Talk About the Impact of AI on Freelance Writers

AI technology has had a huge impact on our lives. A 2023 survey by Pew Research found that 56% of people use AI at least once a day or once a week. … [Read More...]

11 Most Popular Books on Perl Programming

Perl is not the most popular programming language. It has only one million users, compared to 12 million that use Python. However, it has a lot of … [Read More...]

Guides

  • Computer Communications
  • Mobile Computing
  • PC Components
  • PC Data Storage
  • PC Input-Output
  • PC Multimedia
  • Processors (CPUs)

Recent Posts

Remove chat from your Twitch broadcasts: to what extent is it possible and how to limit it as much as possible?

Twitch is a very popular platform that is used by 9.1 million creators. Over 100 billion minutes of twitch content were watched over the past … [Read More...]

Registry Reviver Review

PROS: Installation is easy; it practically installs all on its own. CONS: Registry Reviver isn’t the most comprehensive or extensive registry … [Read More...]

Correct the 403 Forbidden HTML Error

The 403 Forbidden error is another HTTP Status code that means you cannot access the requested pages because it is not allowed for some reason. There … [Read More...]

[footer_backtotop]

Copyright © 2025 About | Privacy | Contact Information | Wrtie For Us | Disclaimer | Copyright License | Authors