dcraw man page on Scientific

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dcraw(1)							      dcraw(1)

       dcraw - command-line decoder for raw digital photos

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

       dcraw decodes raw photos, displays metadata, and extracts thumbnails.

       -v     Print verbose messages, not just warnings and errors.

       -c     Write decoded images or thumbnails to standard output.

       -e     Extract  the  camera-generated  thumbnail,  not  the  raw image.
	      You'll get either a JPEG or a PPM file, depending on the camera.

       -z     Change the access and modification times of an AVI,  JPEG,  TIFF
	      or  raw file to when the photo was taken, assuming that the cam‐
	      era 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.	-i -v shows metadata.

	      dcraw cannot decode JPEG files!!

       -P deadpixels.txt
	      Read the dead pixel list from this file instead of ".badpixels".
	      See FILES for a description of the format.

       -K darkframe.pgm
	      Subtract a dark frame from the raw data.	 To  generate  a  dark
	      frame,	shoot	a   raw	  photo	  with	 no   light   and   do
	      dcraw -D -4 -j -t 0.

       -k darkness
	      When shadows appear foggy, you need to raise the darkness level.
	      To measure this, apply pamsumm -mean to the dark frame generated

       -S saturation
	      When highlights appear pink, you need to	lower  the  saturation
	      level.   To  measure this, take a picture of something shiny and
	      do dcraw -D -4 -j -c photo.raw | pamsumm -max

	      The default darkness and saturation are usually correct.

       -n noise_threshold
	      Use wavelets to erase noise while preserving real	 detail.   The
	      best threshold should be somewhere between 100 and 1000.

       -C red_mag blue_mag
	      Enlarge  the raw red and blue layers by the given factors, typi‐
	      cally 0.999 to 1.001, to correct chromatic aberration.

       -H 0   Clip all highlights to solid white (default).

       -H 1   Leave highlights unclipped in various shades of pink.

       -H 2   Blend clipped and unclipped values together for a	 gradual  fade
	      to white.

       -H 3+  Reconstruct  highlights.	Low numbers favor whites; high numbers
	      favor colors.  Try -H 5 as a compromise.	 If  that's  not  good
	      enough,  do  -H 9,  cut  out the non-white highlights, and paste
	      them into an image generated with -H 3.

       By default, dcraw uses a fixed white balance based  on  a  color	 chart
       illuminated with a standard D65 lamp.

       -w     Use  the	white balance specified by the camera.	If this is not
	      found, print a warning and use another method.

       -a     Calculate the white balance by averaging the entire image.

       -A left top width height
	      Calculate the white balance by  averaging	 a  rectangular	 area.
	      First do dcraw -j -t 0 and select an area of neutral grey color.

       -r mul0 mul1 mul2 mul3
	      Specify  your  own  raw white balance.  These multipliers can be
	      cut and pasted from the output of dcraw -v.

       +M or -M
	      Use (or don't use) any color matrix from	the  camera  metadata.
	      The  default is +M if -w is set, -M otherwise.  This option only
	      affects Olympus, Leaf, and Phase One cameras.

       -o [0-5]
	      Select the output colorspace when the -p option is not used:

		   0   Raw color (unique to each camera)
		   1   sRGB D65 (default)
		   2   Adobe RGB (1998) D65
		   3   Wide Gamut RGB D65
		   4   Kodak ProPhoto RGB D65
		   5   XYZ

       -p camera.icm [ -o output.icm ]
	      Use ICC profiles to define the camera's raw colorspace  and  the
	      desired output colorspace (sRGB by default).

       -p embed
	      Use the ICC profile embedded in the raw photo.

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

       -D     Same as -d, but totally raw (no color scaling).

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

       -q 0   Use high-speed, low-quality bilinear interpolation.

       -q 1   Use Variable Number of Gradients (VNG) interpolation.

       -q 2   Use Patterned Pixel Grouping (PPG) interpolation.

       -q 3   Use Adaptive Homogeneity-Directed (AHD) interpolation.

       -f     Interpolate RGB as four colors.  Use this if  the	 output	 shows
	      false 2x2 meshes with VNG or mazes with AHD.

       -m number_of_passes
	      After  interpolation,  clean  up	color  artifacts by repeatedly
	      applying a 3x3 median filter to the R-G and B-G channels.

       By default, dcraw writes PGM/PPM/PAM with 8-bit samples, a BT.709 gamma
       curve, a histogram-based white level, and no metadata.

       -W     Use a fixed white level, ignoring the image histogram.

       -b brightness
	      Divide the white level by this number, 1.0 by default.

       -g power toe_slope
	      Set  the	gamma curve, by default BT.709 (-g 2.222 4.5).	If you
	      prefer sRGB gamma, use -g 2.4 12.92.  For a simple power	curve,
	      set the toe slope to zero.

       -6     Write sixteen bits per sample instead of eight.

       -4     Linear 16-bit, same as -6 -W -g 1 1.

       -T     Write TIFF with metadata instead of PGM/PPM/PAM.

       -t [0-7,90,180,270]
	      Flip the output image.  By default, dcraw applies the flip spec‐
	      ified by the camera.  -t 0 disables all flipping.

       -j     For Fuji Super CCD cameras, show the image  tilted  45  degrees.
	      For  cameras with non-square pixels, do not stretch the image to
	      its correct aspect ratio.	 In any case, this  option  guarantees
	      that each output pixel corresponds to one raw pixel.

       -s [0..N-1] or -s all
	      If  a file contains N raw images, choose one or "all" to decode.
	      For example, Fuji Super CCD SR cameras generate a	 second	 image
	      underexposed four stops to show detail in the highlights.

       ./.badpixels, ../.badpixels, ../../.badpixels, ...
	      List of your camera's dead pixels, so that dcraw can interpolate
	      around them.  Each line specifies the column, row, and UNIX time
	      of death for one pixel.  For example:

	       962   91 1028350000  # died between August 1 and 4, 2002
	      1285 1067 0	    # don't know when this pixel died

	      These  coordinates  are  before any cropping or rotation, so use
	      dcraw -j -t 0 to locate dead pixels.

       pgm(5), ppm(5), pam(5),	pamsumm(1),  pnmgamma(1),  pnmtotiff(1),  pnm‐
       topng(1), gphoto2(1), cjpeg(1), djpeg(1)

       Written by David Coffin, dcoffin a cybercom o net

				 May 14, 2009			      dcraw(1)

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