QSNAP(1) (pipe) 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 (4K×4K pixels), and 0 in low resolution
mode (2K×2K 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 (4×5 inch).
1 = linear correction table.
2 = Polaroid Type 559 color pack film (4×5 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 (4×5 inch), 4K
mode.
7 = Polaroid Type 809 color film (8×10 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 mul-
tiple 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 (2K×2K) or high (4K×4K) 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 offset in each direction is multiplied
QSNAP(1) (pipe) QSNAP(1)
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, imaging at brightness level
2 produces the best results.
With the 4×5 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 8×10 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)