Updated: 12 April 2005
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cameratopam - convert raw camera image to PAM
cameratopam [input_file_name] [-identify_only] [-quick_in-
[-half_size] [-four_color_rgb] [-document_mode] [-bal-
[-brightness=fraction] [-no_clip_color] [-rgb] [-secondary]
All options can be abbreviated to their shortest unique pre-
fix. You may use
two hyphens instead of one to designate an option. You may use
space or an equals sign between an option name and its value.
This program is part of Netpbm.
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
supplied with the camera allows you to manipulate the im-
information which is lost when the camera converts to the com-
mon format. A
particular camera model often has a unique raw format.
Report to Standard Error the format of the input image
generate an output image. Program fails if it cannot
Report to Standard Error details of the processing.
Use simple bilinear interpolation for quick results.
The default is
to use a slow, high-quality adaptive algorithm.
Half-size the output image. Instead of interpolating,
reduce each 2x2
block of sensors to one pixel. Much faster than
Interpolate RGB as four colors. This causes a slight
loss of detail,
so use this only if you see false 2x2 mesh patterns in
Show the raw data as a grayscale image with no interpo-
lation. This is
good for photographing black and white documents.
Automatic color balance. The default is to use a fixed
based on a white card photographed in sunlight.
Use the color balance specified by the camera. If cam-
find this, it prints a warning and reverts to the de-
Further adjust the color balance by multiplying the red
channels by these values. Both default to 1.0.
Change the output brightness. Default is 1.0.
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.
Write raw camera colors to the output file. By default,
converts to sRGB colorspace.
For cameras based on the Fuji Super CCD SR, this op-
cameratopam to use the secondary sensors, in effect un-
image by four stops to reveal detail in the highlights.
silently ignores this option for all other cameras.
This option causes cameratopam to generate a variation
on PAM that
has "linear" color samples. In true PAM, each sample in
raster is gamma-corrected; i.e. it is essentially pro-
brightness. With the linear option, cameratopam gener-
ates an image in
which the samples are instead proportional to light in-
Without -linear, the image maxval is 255, so the image
byte per sample. With -linear, the maxval is 65535, so
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.
411toppm, pamflip, pam,
cameratopam was new in Netpbm 10.28 (June 2005).
It was derived from the program dcraw by Dave Coffin, by Bryan
April 2005. Bryan replaced the part that generates the Netpbm
and removed the Adobe Photoshop output function. Bryan changed
syntax and and made other small changes to make the program
Netpbm. He also split the source code into manageable pieces
(dcraw has a
single 5000 line source file).
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* SEE ALSO
Man(1) output converted with