Cameratopam User Manual(0) Cameratopam User Manual(0)NAMEcameratopam - convert raw camera image to PAM
[-identify_only] [-quick_interpolate] [-half_size] [-four_color_rgb]
[-document_mode] [-balance_auto] [-balance_camera] [-red_scale=float]
[-blue_scale=float] [-bright=fraction] [-no_clip_color] [-rgb]
[-use_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
This program is part of Netpbm(1)cameratopam converts from any of dozens of raw camera image formats to
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.
Report to Standard Error the format of the input image but don't
generate an output image. Program fails if it cannot recognize
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 interpolation.
This is good for photographing black and white documents.
Automatic color balance. The default is to use a fixed color
balance based on a white card photographed in sunlight.
Use the color balance specified by the camera. If cameratopam
can't find this, it prints a warning and reverts to the default.
Further adjust the color balance by multiplying the red and blue
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 -bright=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.
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.
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 ALSO411toppm(1) , pamflip(1) , pam(1) ,
HISTORYcameratopam was new in Netpbm 10.28 (June 2005).
It was derived from the program dcraw by Dave Coffin
⟨http://www.cybercom.net/~dcoffin/dcraw/⟩ , by Bryan Henderson in April
2005. Bryan replaced the part that generates the Netpbm output image
and removed the Adobe Photoshop output function. Bryan changed the
command syntax and made other small changes to make the program consis‐
tent with Netpbm. He also split the source code into manageable pieces
(dcraw has a single 5000 line source file).
netpbm documentation 12 April 2005 Cameratopam User Manual(0)