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QSNAP(1) General Commands Manual QSNAP(1) NAME qsnap - high resolution digital film printer SYNOPSIS qsnap [ -bfmrxRXY ] [ N ... ] file DESCRIPTION Qsnap produces images on a QCR digital film printer. The input file should be in the form of picfile(5), 3-channel for color or 1-channel for black and white. Option letters appear in one string. Certain options require a numeric argument, N, which follows the string as a separate argument. b N Set the brightness of the image to N, 0<=N<=8; 0 is brightest. The default brightness value is 2 in high resolution mode (4Kx4K pixels), and 0 in low resolution mode (2Kx2K pixels) as set by option R. f N Correct the exposure for a given type of film. Valid film types are: 7, 8, and 0 to 5 inclusive. 0 = (default) Polaroid Type 52 (4x5 inch). 1 = linear correction table. 2 = Polaroid Type 559 color pack film (4x5 inch), 2K mode. 3 = Ektachrome 100 color film (35mm), 2K mode. 4 = Ektachrome 100 color film (35mm), 4K mode. 5 = Polaroid Type 559 color pack film (4x5 inch), 4K mode. 7 = Polaroid Type 809 color film (8x10 inch), 4K mode. 8 = Tmax-100 black&white film (35mm), 2K or 4K mode. m N Set the enlargement factor. The image is enlarged with a simple box filter. Default values are N=3 for 2K resolution and N=6 for 4K. r Expose the red channel of a color image only (for multiple red overlays). x N Expose the image N times. (Useful if the maximum brightness value is not bright enough.) R N Set the resolution, where N is either 2 or 4, to select low (2Kx2K) or high (4Kx4K) resolution, respectively. The default it to leave the resolution unchanged. X N Offset the image along the x-coordinate by N pixels. The 35mm camera in 4K mode may require an X- and/or a Y-offset. The off- set in each direction is multiplied by the enlargement factor. Y N Offset the image along the y-coordinate by N pixels. The imaging resolution for 35mm film is 114 pixels/mm (2895 dots/inch) in high resolution mode, and 57 pixels/mm in low resolution mode. The maximum size image that fits a 35mm negative is 3840x3072 pixels. It takes about 2 minutes to render such an image in black and white, or 6 minutes in color. Since the color film is usually less sensitive to red, it is good practice to expose the red channel of a color image twice, using option r. Kodak Ektachrome color film, 100 ASA, or Kodak Tmax-100 black and white film are recommended. For 100 ASA film, imag- ing at brightness level 2 produces the best results. With the 4x5 inch module, the imaging resolution is 34 pixels/mm (864 dots/inch) in high resolution mode, 17 pixels/mm in low resolution. Polaroid Type 559 color film or Polaroid Type 52 black and white film is recommended. With the 8x10 inch module, the imaging resolution is 17 pixels/mm. This module can only be used in high resolution mode. Polaroid Type 809 color film is recommended. SEE ALSO pico(1), bcp(1), cscan(1), imscan(1), picfile(5) pipe QSNAP(1)