Each option has a name, and information about its type, units, and range or possible values (e.g., enumerated list). These options specify parameters such as the resolution of the scan, the scan area, colour model, etc. Whereas a TWAIN driver handles the user interface as well as communications with the scanner hardware, a SANE driver only provides an interface with the hardware and describes a number of "options" which drive each scan. SANE differs from TWAIN in that it is cleanly separated into " front ends" (user programs) and " back ends" (scanner drivers). Scanner Access Now Easy ( SANE) is an open-source application programming interface (API) that provides standardized access to any raster image scanner hardware ( flatbed scanner, handheld scanner, video- and still-cameras, frame grabbers, etc.). Public domain (SANE standard: API & network protocol) Weakened GPLv2 or later (backend libraries),
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