Sides of a document as it passes through. A majority ofĭuplex scanners have a feeder with a dual sided lens that reads both Scanning of both sides of a document in a single pass. This is useful when a majority of your items that Simplex or Duplex: Simplex scanners have the ability to scan one side of a document. This allows for more flexibility in a single unit. Some scanners offer both flatbed and sheetfedĬapabilities. Larger capacityįeeders allow for larger jobs to be completed with fewer interventionsįrom the user. Offer various sizes of automatic document feeders. The sheetfed scanner willĪutomatically process the sheets and scan them automatically. Scanned in the automatic document feeder. Sheetfed scanners are useful for environments that Scanning takes place or for "irregular" objects (i.e. This is typically used for environments where very limited The image to be scanned is placed on the glass surface and the lid is
Sheetfed: Flatbed scanners offer a flat, glass surface. Typical interpolated resolution offered today.įlatbed vs. The smoother your enlarged images will look.
#Epson scanning at higher than optical resolution software
Interpolated resolution: The ability of the scanner software to "fill-in" spaces between scanned dots. 300 dpi will do wellįor most office applications. Not to be confused with interpolated resolution. The higher the optical resolution, the higher It is the actual number of pixels that the scanner provides Optical Resolution: A measure of how well a scanner can capture an image. Projects requiring great detail, then look for a scanner with a color However, for those that wish to scan photographs or If you plan on doing document scans, then you may not even Typical color depths are 24, 32, 36, 42 andĤ8-bit.
Higher color depth equalsīetter image quality. Color Depth: The number of bits captured per pixel, which is related to the number of possible colors. When choosing a scanner, there are several key attributes that youġ. ScannerGalaxy has a guide for picking scanners. Oh, and don't forget to up-vote if you found this useful I know that the optics: lens, type of light source and sensor technology etc play a role in scan quality, but these are out of this question's context. Pick a scanner where the optical or hardware resolution is as high as possible. They are not important because they simply add (gradient) pixels horizontally/vertically to the original scan (to give a smooth larger image) they don't add any further detail to the original scan These are just software/hybrid means of increasing the resolution. In this case, this means the scan-head moves 1/1200 inches (vertically) per sampling - allowing for more detail to be captured vertically than one with a 1/600 step. Technically, the last number is the number of vertical step movements of the scan-head per inch. This is often given as two numbers say 600 x 1200 dpi the first is often the same as the optical resolution and the last is related to the quality of detail that can be captured vertically - again loosely speaking. Some scanners using a single-pass might have 3 rows of sensors on the scan-head (this doesn't improve quality of scan, it only increases the speed). Side note: If the maximum paper size of a scanner is legal, then there are (600 x 8.5 = 2550) sensors along the scan-head. In this case, there are 600 sensors horizontally per inch on the scan-head. Technically, it is the number of sensors placed per inch (horizontally) on the scan-head. This is often given as a single number say 600dpi and is related to the amount of detail the scan-head can capture horizontally -loosely speaking. The word scan-head simply means the horizontal bar that goes up-and-down along the scanner (for flatbed scanners).