NAME¶
UFRaw - Convert camera RAW images to standard image files.
SYNOPSIS¶
- ufraw [OPTIONS] <rawfile(s)>
- ufraw-batch [OPTIONS] <rawfile(s)>
DESCRIPTION¶
The Unidentified Flying Raw (UFRaw) is a utility to read and manipulate raw
images from digital cameras. It reads raw images using Dave Coffin's raw
conversion utility - DCRaw. UFRaw supports basic color management using Little
CMS, allowing the user to apply color profiles. For Nikon users UFRaw has the
advantage that it can read the camera's tone curves. Even if you don't own a
Nikon, you can still apply a Nikon curve to your images.
By default 'ufraw' displays a preview window for each raw image allowing the
user to tweak the image parameters before saving. If no raw images are given
at the command line, UFRaw will display a file chooser dialog. To process the
images with no questions asked (and no preview) use the command 'ufraw-batch'.
The input files can be either raw images or UFRaw ID-files. ID-files contain a
raw image filename and the parameters for handling the image.
UFRaw can also work as a GIMP plug-in. To activate it simply open a raw image or
a UFRaw ID-file in the GIMP.
OPTIONS¶
The options supplied on the command-line decide the starting-values for the GUI.
The GUI will then allow you to tweak these values before saving the final
image.
General Options¶
- --version
- Display the version of UFRaw and exit.
- --help
- Display a brief description of how to use UFRaw and exit.
- --silent
- Do not display any messages during conversion. This option is only valid
with 'ufraw-batch'.
- --conf=<ID-filename>
- Load all parameters from an ID-file. This feature can be used to tweak the
parameters for one file using the GUI and using those parameters as the
starting point for other images as well.
Image Manipulation Options¶
These command-line options override settings from the default configuration of
UFRaw and from any loaded ID-file. The best way to learn about how these
parameters work is to experiment with the GUI. All parameters correspond
exactly to a setting available in the GUI. Not all parameters in the GUI have
corresponding command-line options.
- --wb=camera|auto
- White balance setting. "camera" means that UFRaw tries to read
the color-temperature and green color component that the camera recorded
in the meta-information in the raw-file. This does not work for all
cameras. If UFRaw fails to read the white-balance information from the
meta-information, it falls back to "auto".
"auto" means that UFRaw calculates the color-temperature and green
color component automatically from the image data.
The white-balance can also be set manually with the --temperature and
--green options.
- --temperature=TEMP
- Manually set the color temperature in Kelvin.
- --green=GREEN
- Green color component. Range 0.20 to 2.50.
- --gamma=GAMMA
- Gamma adjustment of the base curve. Range 0.10 to 1.00. Default 0.45.
- --linearity=LINEARITY
- Linearity of the base curve. Range 0.00 to 1.00. Default 0.10.
- --exposure=auto|EXPOSURE
- Auto exposure or exposure correction in EV. Range -3.00 to 3.00. Default
0.
- --restore=clip|lch|hsv
- Control how highlights are restored when applying negative EV. 'clip'
restores nothing and is therefore safe from any artifacts. 'lch' restores
in LCH space, resulting in restored highlights with soft details (good for
clouds). 'hsv' restores in HSV space, resulting in restored highlights
with sharp details. The default is 'lch'.
- --clip=digital|film
- Control how highlights are clipped when applying positive EV. 'digital'
corresponds to using a linear response, emulating the harsh behaviour of
the digital sensor. 'film' emulate the soft film response. The default is
'digital'.
- --saturation=SAT
- Adjust the color saturation. Range 0.00 to 8.00. Default 1.0, use 0 for
black & white output.
- --wavelet-denoising-threshold=THRESHOLD
- Wavelet denoising threshold (default 0.0).
- --base-curve=manual|linear|custom|camera|CURVE
- Type of tone curve to use. The base curve is a combination of the gamma
curve corrected by the curve specified here. The base curve is applied to
each channel of the raw data after the white balance and color matrix, but
before the ICC transformation.
"manual" means that a manual tone curve is used. This is probably
not very useful as a command-line option, since there is no way to specify
what the curve should look like.
"linear" means that no tone curve corrections is performed.
"custom" means that UFRaw shall use the curve supplied by the
camera in the meta-information in the raw-file.
"camera" means that UFRaw shall use the "custom" curve
only if the camera was set to use it (according to the meta-information).
Otherwise the "linear" curve is used.
CURVE can be the filename (without path) of any curve that was previously
loaded in the GUI.
The default is "camera" if such a curve exists, linear
otherwise.
- --base-curve-file=<curve-file>
- Load the base curve from a file. The curve file format can be either
UFRaw's XML format or Nikon's NTC/NCV format.
- --curve=manual|linear|CURVE
- Type of luminosity curve to use. This curve is applied in HSV space and
therefore hue and saturation should not be effected by it.
"manual" means that a manual luminosity curve is used. This is
probably not very useful as a command-line option, since there is no way
to specify what the curve should look like.
"linear" means that no luminosity correction is performed.
CURVE can be the filename (without path) of any curve that was previously
loaded in the GUI.
The default is "linear".
- --curve-file=<curve-file>
- Load the luminosity curve from a file. The curve file format can be either
UFRaw's XML format or Nikon's NTC/NCV format.
- --black-point=auto|BLACK
- Black-point value. Range 0.0 to 1.0, default 0.0.
- --interpolation=ahd|vng|four-color|ppg|bilinear
- Interpolation algorithm to use when converting from the color filter array
to normal RGB values. AHD (Adaptive Homogeneity Directed) interpolation is
the best, but also the slowest. VNG (Variable Number Gradients) is second
best and a bit faster. Bilinear is the simplest yet fastest interpolation.
"four-color" is a variation of the VNG interpolation that should
only be used if you see strange square patterns in the VNG interpolation,
See <http://www.cybercom.net/~dcoffin/dcraw/>.
AHD is the default interpolation. AHD interpolation is not supported for
cameras with four color filters, such as the Sony-828 RGBE filter. In such
cases, VNG interpolation will be used instead.
- --color-smoothing
- Apply color smoothing.
- --grayscale=none|lightness|luminance|value|mixer
- Grayscale conversion algorithm to use (default none).
- --darkframe=FILE
- Use FILE for raw darkframe subtraction.
Output Options¶
The options which are related to the final output are:
- --shrink=FACTOR
- Shrink the image by FACTOR (default 1).
- --size=SIZE
- Downsize max(height,width) to SIZE.
- --rotate=camera|ANGLE|no
- Rotate image to camera's setting, by ANGLE degrees clockwise, or do not
rotate the image (default camera)
- --crop-(left|right|top|bottom)=PIXELS
- Crop the output to the given pixel range, relative to the raw image after
rotation but before any scaling.
- --out-type=ppm|tiff|tif|png|jpeg|jpg|fits
- Output file-format to use. The default output file-format is ppm.
- --out-depth=8|16
- Output bit depth per channel. ppm, tiff, png and fits output formats can
uses either 8 bits or 16 bits to encode each of the Red, Green and Blue
components of each pixel. The jpeg format only allows for 8 bits for each
color component.
The raw-files contain more than eight bits of information for each color
component. This means that by using an eight bit format, you are actually
discarding some of the information supplied by the camera. This is not a
problem if you only plan to view the image on screen. For prints you
should consider a 16 bits workflow.
- --compression=VALUE
- JPEG quality factor. Range 0-100 with a higher number giving a higher
quality at the cost of a larger file. Default 85. The --compression
parameter is only relevant if the output file-format is jpeg.
- --[no]exif
- Embed exif in output. Default embed exif. Exif is currently embedded in
JPEG, PNG and TIFF output.
- --[no]zip
- Enable [disable] TIFF zip compression. The zip-compression is loss-less.
Default nozip. The --zip parameter is only relevant if the output
file-format if tiff8 or tiff16.
- --out-path=PATH
- PATH for output file. In batch mode by default, output-files are placed in
the same directory as the input-files. In interactive mode UFRaw tries to
''guess'' if you have a favorite output directory.
- --output=FILE
- Output file name to use. This is only relevant if a single raw-file is
supplied on the command-line. . Use '-' to output to stdout. The default
is to name the output-file the same as the input-file but with the
extension given by the output file-format.
- --overwrite
- Overwrite existing files without asking. Default is to ask before deleting
an existing file.
- --create-id=no|also|only
- Control whether UFRaw ID files are created for the output image. (Default
is no).
- --embedded-image
- Extract the preview image embedded in the raw file instead of converting
the raw image. This option is only valid with 'ufraw-batch'.
Conversion Setting Priority¶
Conversion settings are applied in the following priority order:
- 1. Command-line options
- 2. Settings from the configuration file specified with
--conf=<ID-file> (ignoring any filenames in the ID-file).
- 3. Settings from an ID-file supplied as an input-file.
- 4. Settings from $HOME/.ufrawrc
- 5. UFRaw's default settings.
This means that an option supplied on the command-line always takes precedence
over all other options.
The conversion settings can be changed in the GUI before the resulting image is
saved.
FILES¶
$HOME/.ufrawrc - UFRaw resource file containing the user default settings. This
is an XML file that can be modified with any text editor. Still, it is
recommended not to edit this file. This file is updated from the GUI when you
save an image, or when you explicitly ask to save this file in the 'Options'
menu.
$HOME/.ufraw-gtkrc - An optional file for setting up a specific GTK theme for
UFRaw.
ONLINE RESOURCES¶
- UFRaw homepage: <http://ufraw.sourceforge.net>
- DCRaw homepage: <http://www.cybercom.net/~dcoffin/dcraw>
SEE ALSO¶
- The GIMP homepage: <http://www.gimp.org>