A scanner is a computing device which analyses images, handwriting or printed text and converts them into a digital image for future usage. Most of the modern day scanners are variations of the flatbed scanner. The scanners usually make use of the charge-coupled device (CCD) or the Contact Image Sensor (CIS) technology to deliver results. Let us have a look at the functionality of the scanners.



The Scanner Functionality:

A scanner usually reads the red-green-blue (RGB) colour from an array. This is then followed with data processing with the help of a proprietary algorithm for correcting several exposure conditions. The processed data is then sent to a computer through the input-output device interface. The colour depth is typically 24 bits but the high quality models typically have a colour depth of 48 bits.

Things to know about Scanners:

The resolution quality of the scanner is measured in pixels per inch (PPI) or samples per inch (SPI). A good drum scanner comes with an optical resolution of 8,000-14,000 dpi whereas a good flatbed scanner can easily scan up to 5400 dpi while a normal flatbed scanner can scan up to 1,600-3,200 dpi. If the file size is an issue with you and you can compromise on the overall quality, you can look for a normal scanner. On the other hand, if the file size is not an issue and the overall quality matters a lot to you, then you can go for a interpolated resolution scanner which has an exceptionally high resolution of 19,200 dpi but means a large file size.

A scanner can be easily attached to a computer with the help of a parallel port, Small Computer System Interface (SCSI), Universal Serial Bus (USB) or FireWire interface.

Today's market scenario:

The present day market is full of numerous scanning devices from several manufacturers. Some of the leading scanner manufacturers are HP, Canon, Epson, Fujitsu and Kodak. If you are looking for a high quality scanning device, then the market leader, Hewlett Packard (HP), is the brand for you. HP scanners are high on overall quality, consume less space and are high on performance. They provide a high degree of flexibility and portability without any fail.

The HP photo scanners such as the HP Scanjet 4850 Photosmart Scanner, HP Scanjet 4890 and HP SJ G3010 Photo Scanners have been able to win the laurels of customers from all parts of the world. These photo scanners are exceptionally high in quality and performance and are available at a highly affordable price.

So if you are looking for a photo scanner, then the HP scanners are great options to choose from. Get the best from the market leader, now!