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GNU/Linux |
Ubuntu 9.04(Jaunty Jackalope) |
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dcraw(1) |
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dcraw - command-line decoder for raw digital photos
dcraw [OPTION]... [FILE]...
dcraw decodes raw photos, displays metadata, and extracts thumbnails.
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-v |
Print verbose messages, not just warnings and errors. | ||
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-c |
Write decoded images or thumbnails to standard output. | ||
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-e |
Extract the camera-generated thumbnail, not the raw image. You’ll get either a JPEG or a PPM file, depending on the camera. | ||
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-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 Universal Time. | ||
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-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. | ||
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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 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
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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.
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-H 0 |
Clip all highlights to solid white (default). | ||
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-H 1 |
Leave highlights unclipped in various shades of pink. | ||
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-H 2 |
Blend clipped and unclipped values together for a gradual fade to white. | ||
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-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.
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-w |
Use the white balance specified by the camera. If this is not found, print a warning and use another method. | ||
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-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.
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-d |
Show the raw data as a grayscale image with no interpolation. Good for photographing black-and-white documents. | ||
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-D |
Same as -d, but totally raw (no color scaling). | ||
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-h |
Output a half-size color image. Twice as fast as -q 0. | ||
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-q 0 |
Use high-speed, low-quality bilinear interpolation. | ||
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-q 1 |
Use Variable Number of Gradients (VNG) interpolation. | ||
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-q 2 |
Use Patterned Pixel Grouping (PPG) interpolation. | ||
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-q 3 |
Use Adaptive Homogeneity-Directed (AHD) interpolation. | ||
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-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.
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-W |
Use a fixed white level, ignoring the image histogram. |
-b brightness
Divide the white level by this number, 1.0 by default.
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-4 |
Write 16-bit linear samples (fixed white level, no gamma). | ||
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-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.
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-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), pnmtopng(1), gphoto2(1), cjpeg(1), djpeg(1)
Written by David Coffin, dcoffin a cybercom o net
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dcraw(1) | |