How Does Scanner Work?

How does scanner work? There are many type of scanner. We are going to talk about the flat beds scanner. Flatbed scanner are the most widely used and versatile type of scanner. The simple way to describe how a scanner work is it converts light into digits so your computer understands. This applies to all types of scanner. A scanner is not much different from a photocopier. The copier will print a sheet of paper and a scanner stores the cop of the image in a file.
For a scanner to scan image it use several thousand charge coupled devices as their eyes. These ting components convert the amount of light received into electrical impulses. The strength of the impulses depends on the intensity of light that strikes them. They send that information to your computer. Computer can only to understand whole numbers. The impulses are translated from analog to digital. Then the photos are stored as a group of integers.
For a photo scanner to capture a whole image the scanner divides the image into a grid and use a row of scan head to record how much light it reflected in each location. Then when your computer has the data it creates a file that represents the image in digital form. Each of the cells that are in the grid is called a pixel each pixel contains a shade or a color of gray. The photo is completed when the pixels are all combined. Scanner different in two ways. How many pixels can they measure? And how the actual scanner process occurs.
The color and the intensity of each pixel are determined in one or more bits of data. The number of bits is referred to the number of colors each pixel can contain. The most common are one bit, 8 bit, and 24bit. The 1 bit scanner is the most basic type of scanner because it only records black and white. The bits are only able to express two values on or off.
The majority of scanner today have at least 24bit because they collets 8bits of information about each of the three primary scanning colors. Scanners depend on the quality of light sauce. The lights determine the quality of the resulting in your scan. Most quality scanners use a cold cathode bulb. These bulbs produce whiter and more consistent light and they produce less heat compared the fluorescent bulb.
There is optics inside scanner. Scanner use prisms, lensee and optical part to direct light from the bulb to the charge coupled devices. Optical parts can vary in your scanner. The high quality scanner use high quality glass optics. That is cool corrected and coated for minimum diffusion.
Some of the lower priced scanner use plastic components to keep the cost down. Flatbed scanner use several different methods of reading light values most flatbed scanner use a single pass method with a beam splitter or a coated charge coupled devices. When a beam is splitter it uses light to pass through a prism and separates into the three primary scanning colors.
The different charge coupled devices read each color. Some scanner use the three charge coupled devices to hold down the cost. Color scanner usually requires .The three separate scanning passes one for each red, green and blue. The diodes sweep across the source image. They distinct reading is taken, vertically and horizontally and they determine the resolution of the scan.