dcraw(1)							      dcraw(1)



NAME
       dcraw - convert raw digital photos to PPM format

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

DESCRIPTION
       dcraw  converts	a  list	of raw digital camera files to ppm(5) format.
       Dozens of cameras are supported, and new ones are added as  they	reach
       the market.

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

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

       -v     Print  verbose  messages.	Otherwise, dcraw prints only warnings
	      and errors.

       -f     Interpolate RGB as four colors.  The default is to  assume  that
	      all  green  pixels  are  the same.  If even-row green pixels are
	      more sensitive to ultraviolet light than odd-row	green  pixels,
	      this  difference causes a mesh pattern in the output.  -f solves
	      this problem with minimal loss of detail.

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

       -q     Use  simple  bilinear  interpolation  for	quick	results.   The
	      default is to use a slow, high-quality adaptive algorithm.

       -h     Half-size the output image.  Instead  of	interpolating,	reduce
	      each 2x2 block of sensors to one pixel.  Much faster than -q.

       -g gamma
	      Specify the gamma value for eight-bit output.  Default is 0.6.

       -b brightness
	      Specify the output brightness.  Default is 1.0.

       -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
	      After  all  other	color	adjustments, multiply the red and blue
	      channels by these values.	Default is 1.0.

       -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 the image.

       -2     Write eight bits per color value with gamma correction and auto-
	      matic brightness adjustment.  Double the height if necessary  to
	      correct the aspect ratio.	This is the default.

       -4     Write sixteen bits per color value, with no gamma correction, no
	      brightness adjustment, and no changes to the 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).

BUGS
       The -w option does not work with many cameras.

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

       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!

TIPS
       First raise the brightness if the highlights are too dark,  then	lower
       the gamma if the lowlights are too dark.	Use -q or -h until you get it
       right.

       To balance the color, do "dcraw -q -g 1 -b 0.5" and select a  rectangle
       of  something  that you know is white.  Compute the average R, G, and B
       values for this area, then set red_mul and blue_mul to G/R and G/B.

AUTHOR
       Written by David Coffin, dcoffin a cybercom o net



			       September 5, 2004		      dcraw(1)