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Cameratopam User Manual(0)                          Cameratopam User Manual(0)

       cameratopam - convert raw camera image to PAM



       [-identify_only]  [-quick_interpolate]  [-half_size]  [-four_color_rgb] [-document_mode] [-balance_auto] [-bal-
       ance_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 des-
       ignate an option.  You may use either white space or an equals sign between an option name and its value.

       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 infor-
       mation 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 the format.

              Report to Standard Error details of the processing.

              Use simple bilinear interpolation for quick results.  The default is to use a slow,  high-quality  adap-
              tive algorithm.

              Half-size  the  output  image.  Instead of interpolating, reduce each 2x2 block of sensors to one pixel.
              Much faster than -quick_interpolate.

              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.

              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, cameratoapm converts to sRGB colorspace.

              For cameras based on the Fuji Super CCD SR, this option causes cameratopam to use the secondary sensors,
              in  effect  underexposing  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 proportional to bright-
              ness.  With the linear option, cameratopam generates an image in which the samples are  instead  propor-
              tional 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.

       411toppm(1), pamflip(1), pam(1),

       cameratopam was new in Netpbm 10.28 (June 2005).

       It  was  derived  from the program dcraw by Dave Coffin , 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 and made other small changes to make the program consistent 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)