1dcraw(1)                    General Commands Manual                   dcraw(1)
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NAME

6       dcraw - command-line decoder for raw digital photos
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SYNOPSIS

9       dcraw [OPTION]... [FILE]...
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DESCRIPTION

12       dcraw decodes raw photos, displays metadata, and extracts thumbnails.
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GENERAL OPTIONS

15       -v     Print verbose messages, not just warnings and errors.
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17       -c     Write decoded images or thumbnails to standard output.
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19       -e     Extract  the  camera-generated  thumbnail,  not  the  raw image.
20              You'll get either a JPEG or a PPM file, depending on the camera.
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22       -z     Change the access and modification times of an AVI,  JPEG,  TIFF
23              or  raw file to when the photo was taken, assuming that the cam‐
24              era clock was set to Universal Time.
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26       -i     Identify files but don't decode them.  Exit status is 0 if dcraw
27              can decode the last file, 1 if it can't.  -i -v shows metadata.
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29              dcraw cannot decode JPEG files!!
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REPAIR OPTIONS

32       -I     Read  the  raw pixels from standard input in CPU byte order with
33              no header.  Use dcraw -E -4 to get the raw pixel values.
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35       -P deadpixels.txt
36              Read the dead pixel list from this file instead of ".badpixels".
37              See FILES for a description of the format.
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39       -K darkframe.pgm
40              Subtract  a  dark  frame  from the raw data.  To generate a dark
41              frame,   shoot   a   raw   photo   with   no   light   and    do
42              dcraw -D -4 -j -t 0.
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44       -k darkness
45              When shadows appear foggy, you need to raise the darkness level.
46              To measure this, apply pamsumm -mean to the dark frame generated
47              above.
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49       -S saturation
50              When  highlights  appear  pink, you need to lower the saturation
51              level.  To measure this, take a picture of something  shiny  and
52              do dcraw -D -4 -j -c photo.raw | pamsumm -max
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54              The default darkness and saturation are usually correct.
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56       -n noise_threshold
57              Use  wavelets  to erase noise while preserving real detail.  The
58              best threshold should be somewhere between 100 and 1000.
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60       -C red_mag blue_mag
61              Enlarge the raw red and blue layers by the given factors,  typi‐
62              cally 0.999 to 1.001, to correct chromatic aberration.
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64       -H 0   Clip all highlights to solid white (default).
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66       -H 1   Leave highlights unclipped in various shades of pink.
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68       -H 2   Blend  clipped  and unclipped values together for a gradual fade
69              to white.
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71       -H 3+  Reconstruct highlights.  Low numbers favor whites; high  numbers
72              favor  colors.   Try  -H  5 as a compromise.  If that's not good
73              enough, do -H 9, cut out the  non-white  highlights,  and  paste
74              them into an image generated with -H 3.
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COLOR OPTIONS

77       By  default,  dcraw  uses  a fixed white balance based on a color chart
78       illuminated with a standard D65 lamp.
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80       -w     Use the white balance specified by the camera.  If this  is  not
81              found, print a warning and use another method.
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83       -a     Calculate the white balance by averaging the entire image.
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85       -A left top width height
86              Calculate  the  white  balance  by averaging a rectangular area.
87              First do dcraw -j -t 0 and select an area of neutral grey color.
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89       -r mul0 mul1 mul2 mul3
90              Specify your own raw white balance.  These  multipliers  can  be
91              cut and pasted from the output of dcraw -v.
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93       +M or -M
94              Use  (or  don't  use) any color matrix from the camera metadata.
95              The default is +M if -w is set, -M otherwise.  This option  only
96              affects Olympus, Leaf, and Phase One cameras.
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98       -o [0-5]
99              Select the output colorspace when the -p option is not used:
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101                   0   Raw color (unique to each camera)
102                   1   sRGB D65 (default)
103                   2   Adobe RGB (1998) D65
104                   3   Wide Gamut RGB D65
105                   4   Kodak ProPhoto RGB D65
106                   5   XYZ
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108       -p camera.icm [ -o output.icm ]
109              Use  ICC  profiles to define the camera's raw colorspace and the
110              desired output colorspace (sRGB by default).
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112       -p embed
113              Use the ICC profile embedded in the raw photo.
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INTERPOLATION OPTIONS

116       -d     Show the raw data as a grayscale image  with  no  interpolation.
117              Good for photographing black-and-white documents.
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119       -D     Same as -d, but with the original unscaled pixel values.
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121       -E     Same as -D, but masked pixels are not cropped.
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123       -h     Output a half-size color image.  Twice as fast as -q 0.
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125       -q 0   Use high-speed, low-quality bilinear interpolation.
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127       -q 1   Use Variable Number of Gradients (VNG) interpolation.
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129       -q 2   Use Patterned Pixel Grouping (PPG) interpolation.
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131       -q 3   Use Adaptive Homogeneity-Directed (AHD) interpolation.
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133       -f     Interpolate  RGB  as  four colors.  Use this if the output shows
134              false 2x2 meshes with VNG or mazes with AHD.
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136       -m number_of_passes
137              After interpolation, clean  up  color  artifacts  by  repeatedly
138              applying a 3x3 median filter to the R-G and B-G channels.
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OUTPUT OPTIONS

141       By default, dcraw writes PGM/PPM/PAM with 8-bit samples, a BT.709 gamma
142       curve, a histogram-based white level, and no metadata.
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144       -W     Use a fixed white level, ignoring the image histogram.
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146       -b brightness
147              Divide the white level by this number, 1.0 by default.
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149       -g power toe_slope
150              Set the gamma curve, by default BT.709 (-g 2.222 4.5).   If  you
151              prefer  sRGB gamma, use -g 2.4 12.92.  For a simple power curve,
152              set the toe slope to zero.
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154       -6     Write sixteen bits per sample instead of eight.
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156       -4     Linear 16-bit, same as -6 -W -g 1 1.
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158       -T     Write TIFF with metadata instead of PGM/PPM/PAM.
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160       -t [0-7,90,180,270]
161              Flip the output image.  By default, dcraw applies the flip spec‐
162              ified by the camera.  -t 0 disables all flipping.
163
164       -j     For  Fuji Super CCD  cameras,  show the image tilted 45 degrees.
165              For cameras with non-square pixels, do not stretch the image  to
166              its  correct  aspect ratio.  In any case, this option guarantees
167              that each output pixel corresponds to one raw pixel.
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169       -s [0..N-1] or -s all
170              If a file contains N raw images, choose one or "all" to  decode.
171              For  example,  Fuji Super CCD SR cameras generate a second image
172              underexposed four stops to show detail in the highlights.
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FILES

175       ./.badpixels, ../.badpixels, ../../.badpixels, ...
176              List of your camera's dead pixels, so that dcraw can interpolate
177              around them.  Each line specifies the column, row, and UNIX time
178              of death for one pixel.  For example:
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180               962   91 1028350000  # died between August 1 and 4, 2002
181              1285 1067 0           # don't know when this pixel died
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183              These coordinates are before any cropping or  rotation,  so  use
184              dcraw -j -t 0 to locate dead pixels.
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SEE ALSO

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

191       Written by David Coffin, dcoffin a cybercom o net
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195                                 May 14, 2009                         dcraw(1)
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