Cameratopam User Manual(1) General Commands Manual Cameratopam User Manual(1)
NAME
cameratopam - convert raw camera image to PAM
SYNOPSIS
cameratopam
[input_file_name]
[-identify_only] [-quick_interpolate] [-half_size] [-four_color_rgb]
[-document_mode] [-balance_auto] [-balance_camera] [-red_scale=float]
[-blue_scale=float] [-brightness=fraction] [-no_clip_color] [-rgb]
[-secondary] [-linear] [-verbose]
All options can be abbreviated to their shortest unique prefix. You
may use two hyphens instead of one to designate an option. You may use
either white space or an equals sign between an option name and its
value.
DESCRIPTION
This program is part of Netpbm(1).
cameratopam converts from any of dozens of raw camera image formats to
PAM.
Digital still cameras often can produce images in a special raw format
in addition to something more standard such as TIFF or JFIF (JPEG).
Software supplied with the camera allows you to manipulate the image
using information which is lost when the camera converts to the common
format. A particular camera model often has a unique raw format.
OPTIONS
In addition to the options common to all programs based on libnetpbm
(most notably -quiet, see
Common Options ⟨index.html#commonoptions⟩ ), cameratopam recognizes
the following command line options:
-identify_only
Report to Standard Error the format of the input image but don't
generate an output image. Program fails if it cannot recognize
the format.
-verbose
Report to Standard Error details of the processing.
-quick_interpolate
Use simple bilinear interpolation for quick results. The de-
fault is to use a slow, high-quality adaptive algorithm.
-half_size
Half-size the output image. Instead of interpolating, reduce
each 2x2 block of sensors to one pixel. Much faster than
-quick_interpolate.
-four_color_rgb
Interpolate RGB as four colors. This causes a slight loss of
detail, so use this only if you see false 2x2 mesh patterns in
blue sky.
-document_mode
Show the raw data as a grayscale image with no interpolation.
This is good for photographing black and white documents.
-balance_auto
Automatic color balance. The default is to use a fixed color
balance based on a white card photographed in sunlight.
-balance_camera
Use the color balance specified by the camera. If cameratopam
can't find this, it prints a warning and reverts to the default.
-red_scale=float
-blue_scalefloat
Further adjust the color balance by multiplying the red and blue
channels by these values. Both default to 1.0.
-brightness=float
Change the output brightness. Default is 1.0.
-no_clip_color
By default, cameratoapm clips all colors to prevent pink hues in
the highlights. Combine this option with -brightness=0.25 to
leave the image data completely unclipped.
-rgb Write raw camera colors to the output file. By default, camera-
toapm converts to sRGB colorspace.
-secondary
For cameras based on the Fuji Super CCD SR, this option causes
cameratopam to use the secondary sensors, in effect underexpos-
ing the image by four stops to reveal detail in the highlights.
cameratopam silently ignores this option for all other cameras.
-linear
This option causes cameratopam to generate a variation on PAM
that has "linear" color samples. In true PAM, each sample in
the image raster is gamma-corrected; i.e. it is essentially pro-
portional to brightness. With the linear option, cameratopam
generates an image in which the samples are instead proportional
to light intensity.
Without -linear, the image maxval is 255, so the image contains
one byte per sample. With -linear, the maxval is 65535, so the
image contains two bytes per sample.
Without -linear, cameratopam uses a 99th percentile white point.
With -linear, it doesn't. I don't know what that means.
SEE ALSO
411toppm(1), pamflip(1), pam(1),
HISTORY
cameratopam was new in Netpbm 10.28 (June 2005).
It was derived from the program dcraw by Dave Coffin
⟨https://dechifro.org/dcraw/⟩ , by Bryan Henderson in April 2005.
Bryan replaced the part that generates the Netpbm output image and re-
moved the Adobe Photoshop output function. Bryan changed the command
syntax and made other small changes to make the program consistent with
Netpbm. He also split the source code into manageable pieces (dcraw
had a single 5000 line source file).
DOCUMENT SOURCE
This manual page was generated by the Netpbm tool 'makeman' from HTML
source. The master documentation is at
http://netpbm.sourceforge.net/doc/cameratopam.html
netpbm documentation 12 April 2005 Cameratopam User Manual(1)
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