SYNOPSIS

       dcraw [OPTION]... [FILE]...


DESCRIPTION

       dcraw converts raw digital photos to ppm(5) format.


OPTIONS

       -v     Print  verbose  messages.  The default is to print only warnings
              and errors.

       -z     Change the access and modification times of a JPEG or  raw  file
              to  when the photo was taken, assuming that the camera clock was
              set to Universal Time.

       -i     Identify files but don't decode them.  Exit status is 0 if dcraw
              can decode the last file, 1 if it can't.

              dcraw cannot decode JPEG files!!

       -c     Write  binary  image data to standard output.  By default, dcraw
              creates files with a ".ppm" extension.

       -d     Show the raw data as a grayscale image  with  no  interpolation.
              Good for photographing black-and-white documents.

       -q [0-3]
              Set the interpolation quality (default is 3):

                   0   Bilinear (very fast, low quality)
                   1   Reserved
                   2   Variable Number of Gradients (VNG)
                   3   Adaptive Homogeneity-Directed (AHD)

       -h     Output a half-size image.  Twice as fast as -q 0.

       -f     Interpolate  RGB as four colors.  This blurs the image a little,
              but it eliminates false 2x2 mesh patterns.

       -B sigma_domain sigma_range
              Use a bilateral filter to smooth noise while  preserving  edges.
              sigma_domain  is  in  units  of  pixels, while sigma_range is in
              units of CIELab colorspace.  Try -B 2 4 to start.

       -a     Automatic color balance.  The default is to use  a  fixed  color
              balance based on a white card photographed in sunlight.

       -w     Use the color balance specified by the camera.  If this can't be
              found, dcraw prints a warning and reverts to the default.

       -r red_mul -l blue_mul
              Further adjust the color balance by multiplying the red and blue
              output channels by these values.  Both default to 1.0.

       -j     For Fuji Super CCD cameras, show the image tilted 45 degrees  so
              that each output pixel corresponds to one raw pixel.

       -s     For  Fuji Super CCD SR  cameras,  use  the secondary sensors, in
              effect underexposing the image by four stops to reveal detail in
              the highlights.

              For all other cameras, -j and -s are silently ignored.

       -t [0-7]
              Flip  the output image.  The most common flips are 5 (90 degrees
              CCW) and 6 (90 degrees clockwise).  By default, dcraw  tries  to
              use  the  flip specified by the camera.  "-t 0" forces dcraw not
              to flip images.

       -2     Write eight bits per color value with  a  99th-percentile  white
              point  and  the standard 0.45 gamma curve.  Double the height if
              necessary to correct the aspect ratio.  This is the default.

       -4     Write sixteen bits per color value.  Output is linear with input
              -- no white point, no gamma, same aspect ratio.

       -3     Same  image  as  -4,  written  in  Adobe PhotoShop format.  File
              extension is ".psd".


SEE ALSO

       ppm(5), ppm2tiff(1), pnmtotiff(1), pnmtopng(1), gphoto2(1), djpeg(1)


BUGS

       The -w option does not work with many cameras.

       No attempt is made to save camera settings or thumbnail images.

       The author stubbornly refuses to add more output formats.

       Don't expect dcraw to produce the same images as software  provided  by
       the camera vendor.  Sometimes dcraw gives better results!


AUTHOR

       Written by David Coffin, dcoffin a cybercom o net



                              September 29, 2005                      dcraw(1)

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