Man page for apt-get dcraw Command
This tutorial shows the man page for man dcraw in linux.
Open terminal with 'su' access and type the command as shown below:
man dcraw
Result of the Command Execution shown below:
dcraw(1) dcraw(1)
NAME
dcraw command line decoder for raw digital photos
SYNOPSIS
dcraw [OPTION]... [FILE]...
DESCRIPTION
dcraw decodes raw photos, displays metadata, and extracts thumbnails.
GENERAL OPTIONS
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 camera clock was set to Uni
versal 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!!
REPAIR OPTIONS
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 above.
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, typically 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.
COLOR OPTIONS
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.
INTERPOLATION OPTIONS
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.
OUTPUT OPTIONS
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.
4 Write 16 bit linear samples (fixed white level, no gamma).
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 specified 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.
FILES
./.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
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