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CCD Flatbed Computer Scanners

Benefits of Scanning with a CCD Flatbed Scanner

Flatbed scanners scan photographs, pictures, letters and other items for saving on your computer. In general, there are two types of scanning technologies that determine the quality of a scan. The first is Contact Image Sensory (CIS) technology and the other is Charged-Coupled Device (CCD) technology.

What makes CCD scanners different than CIS scanners?

In a CIS scanner, light is sent straight into a line-up of lenses into the image sensor in order to scan an image with red, green, and blue light. In a CCD scanner, the CCD technology deflects light by using mirrors and then gathers the reflected light and sends it to an image sensor. The benefits of this include:

  • Better color depth and accuracy
  • Faster speed
  • Higher resolution for large-format, high-quality images
Can CCD scanners be used for artistic applications?

Its important to know that both kinds can scan very well. However, the light-capturing system used by CCD scanners are more suited for artistic pursuits. This is because the whole image is captured and compressed by the mirrors and a lens. The final result is a sharper, more colorful image no matter the physical size of the piece that you scan.

What are some other benefits of having a CCD flatbed scanner?

These scanners are useful for scanning many different sheets of folded paper at once. There is usually software installed in them that can be used to adjust the range and depth of the scan. Any interfering bends or folds that might otherwise show up on the scanned image are less visible. This translates into added detail, clarity, and sharpness in the resulting images.

What DPI ranges are available on these kinds of scanners?

The DPI range on flatbed scanners can vary. The higher the DPI level, the sharper the image scan. These scanning devices might have a range as high as 4800 by 9600 dpi or as low as 1200 by 1200 dpi.

The human eye probably wont notice the difference once dpi is higher than 2400 dpi. Higher dpi scanning levels matter mostly in cases of bright colors and sharp images. Computer graphic or picture files start becoming very large when dpi ranges are higher. If you design websites, remember that larger image files take longer to load on web pages.

Does CCD scanner bit depth play a role in image quality?

Along with the DPI capabilities, scanning bit depth is important. Most scanners of the past operated with 24 to 36 bit technology. CCD flatbed scanners have 48-bit capabilities. This means that less passes of the lens are required for a clear scan. It also means that more information is being gathered with every pass about the document or photograph you scan, which produces sharper images.