Proceedings PaperA High Resolution Desktop Color Scanner For 35 mm Transparencies
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A novel device for digitizing 35 mm transparencies has been designed by Barneyscan Corporation to provide medium-high resolution image input to microcomputers. The basic concept of the scanner is that a 35 mm slide moves on a linear track in front of a lens and a linear sensor while illuminated with a slit light source. Three passes are made for color digitizing; red, green and blue separation filters are interposed for each respective pass. A single pass greyscale mode is also included. The 1024-element photo array measures each of 1520 lines in the direction of slide travel, yielding 1.5 million pixels. Each pixel is digitized to 256 levels (8 bits) of intensity per primary color, or 16,800,00 shades. The resulting file size is 4.5 megabytes. Extensive software for pre-calibration and for automatic control of scan settings is included. Image processing software for cropping, resizing, color correction, sharpening and file format conversion is also included. Resultant images can be displayed, modified and edited, saved to disk or to hard copy, or distributed over a network.