pctechguide.com

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

Scanner Interpolation

Scanners typically offer resolutions of 2,400dpi, 4,800dpi and 9,600dpi. Its important to realise that scanners simply aren’t capable of picking up this level of detail. The actual optical resolution of the CCDs in most modern scanners is 600 x 1,200dpi at best and all higher figures are based on interpolation.

Note that the specification of a non-uniform resolution – for example, 600 x 1200dpi – necessarily implies hardware interpolation, since the acquisition of data at 600dpi in one axis and 1200dpi in the other clearly cannot result in a square of data. At 600 x 600dpi such a scanner will interpolate the 1200dpi dimension down to 600dpi (usually done by merely running the stepper motor that moves the light bar at twice its minimum rate), or at 1200 x 1200dpi they interpolate up the x dimension. Basically, an integrated circuit chip in the scanner generates new data by taking the dots the scanner actually sees, and calculating where the dots in-between would most likely fall, using an algorithm to guess the colour of the new dots by averaging the colour of adjacent dots.

Software interpolation can increase the resolution even more than hardware interpolation. It is performed by the PC’s processor under the control of the scanner’s TWAIN driver software. The problem is that best guesses can never be truly accurate. Interpolated images will always seem too smooth and slightly out of focus. This doesn’t matter so much with line-art where interpolation has the effect of smoothing out jagged edges. But for continuous-tone images like photographs its often better to stick with a scanner’s actual optical resolution.

  • 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

Celeron Coppermine

In the spring of 2000 the packaging picture became even more complicated with the announcement of the first Celeron processors derived from Intel's 0.18-micron Pentium III Coppermine core. These were produced using yet another form factor - … [Read More...]

Dealing with Excel VBA Macros

In this tutorial we will provide an overview of the topic of VBA Functions and User-defined Functions (UDF). We will mention the practices in approaching macros without arguments, functions with one argument and functions with two arguments. We will see some examples of functions with each of these … [Read More...]

Graphics Card Driver Un-Installation

It's important to uninstall your existing drivers so as to avoid any potential conflict with those for your new card. If the drivers in question came with their own uninstall utility, then use that. If not, the odds are that you'll be able to remove its drivers via Add/Remove Programs, … [Read More...]

Why Cross-Chain Trading Is the Future of Crypto Investing?

The rapid growth and evolution of the cryptocurrency market have opened up exciting opportunities for investors. Within this dynamic landscape, … [Read More...]

Revolutionize Your Internet Experience with Orbi 960 – The Ultimate WiFi System

In a world where seamless connectivity is essential, slow and unreliable internet connections are a major problem. Whether you are running a business, … [Read More...]

Do You Need a VPN When Trading Cryptocurrency?

There’s no doubt that the biggest global industries in 2023 are tech-driven, while there remains a significant crossover between many of these … [Read More...]

Goodbye Bitcoin: the 3 alternative cryptocurrencies that have great upside potential, according to experts

Bitcoin has been a very lucrative investment for people that got into it early. One report from The Motley Fool pointed out that $10 of bitcoin … [Read More...]

Self-driving cars face their Achilles’ heel and may be targets of hackers

The market for self-driving cars is booming. Customers spent $22.22 billion on these autonomous vehicles in 2021 and they will likely spend more in … [Read More...]

How to avoid scams with bitcoin and other cryptocurrencies

Cryptocurrencies got a bad reputation when scams multiplied like ants on a piece of cake. Even today many people associate bitcoin and other … [Read More...]

Guides

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

Recent Posts

Differences Between Spyware, Malware and Others

There are countless ways that your computer can be infected by harmful elements but the vast majority of them come down to the four usual … [Read More...]

Pentium 4 Fan

A boxed Pentium 4 processor includes a high quality unattached fan heatsink specifically designed to provide sufficient cooling to the Pentium 4 … [Read More...]

LCD Projectors

Since the LCD panels of a projector are too small to apply a colour filter by vapour deposition in the same manner as … [Read More...]

[footer_backtotop]

Copyright © 2023 About | Privacy | Contact Information | Wrtie For Us | Disclaimer | Copyright License | Authors