1Cameratopam User Manual(0) Cameratopam User Manual(0)
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6 cameratopam - convert raw camera image to PAM
7
10 cameratopam
11 [input_file_name]
13 [-identify_only] [-quick_interpolate] [-half_size] [-four_color_rgb]
15 [-document_mode] [-balance_auto] [-balance_camera] [-red_scale=float]
16 [-blue_scale=float] [-bright=fraction] [-no_clip_color] [-rgb]
17 [-use_secondary] [-linear] [-verbose]
18 All options can be abbreviated to their shortest unique prefix. You
20 may use two hyphens instead of one to designate an option. You may use
21 either white space or an equals sign between an option name and its
22 value.
23
26 This program is part of Netpbm(1).
27 cameratopam converts from any of dozens of raw camera image formats to
29 PAM.
30 Digital still cameras often can produce images in a special raw format
32 in addition to something more standard such as TIFF or JFIF (JPEG).
33 Software supplied with the camera allows you to manipulate the image
34 using information which is lost when the camera converts to the common
35 format. A particular camera model often has a unique raw format.
36
41 -identify_only
42 Report to Standard Error the format of the input image but don't
43 generate an output image. Program fails if it cannot recognize
44 the format.
45 -verbose
48 Report to Standard Error details of the processing.
49 -quick_interpolate
52 Use simple bilinear interpolation for quick results. The
53 default is to use a slow, high-quality adaptive algorithm.
54 -half_size
57 Half-size the output image. Instead of interpolating, reduce
58 each 2x2 block of sensors to one pixel. Much faster than
59 -quick_interpolate.
60 -four_color_rgb
63 Interpolate RGB as four colors. This causes a slight loss of
64 detail, so use this only if you see false 2x2 mesh patterns in
65 blue sky.
66 -document_mode
69 Show the raw data as a grayscale image with no interpolation.
70 This is good for photographing black and white documents.
71 -balance_auto
74 Automatic color balance. The default is to use a fixed color
75 balance based on a white card photographed in sunlight.
76 -balance_camera
79 Use the color balance specified by the camera. If cameratopam
80 can't find this, it prints a warning and reverts to the default.
81 -red_scale=float
84 -blue_scalefloat
86 Further adjust the color balance by multiplying the red and blue
87 channels by these values. Both default to 1.0.
88 -bright=float
91 Change the output brightness. Default is 1.0.
92 -no_clip_color
95 By default, cameratoapm clips all colors to prevent pink hues in
96 the highlights. Combine this option with -bright=0.25 to leave
97 the image data completely unclipped.
98 -rgb Write raw camera colors to the output file. By default, camera‐
101 toapm converts to sRGB colorspace.
102 -use_secondary
105 For cameras based on the Fuji Super CCD SR, this option causes
106 cameratopam to use the secondary sensors, in effect underexpos‐
107 ing the image by four stops to reveal detail in the highlights.
108 cameratopam silently ignores this option for all other cameras.
109 -linear
112 This option causes cameratopam to generate a variation on PAM
113 that has 'linear' color samples. In true PAM, each sample in
114 the image raster is gamma-corrected; i.e. it is essentially pro‐
115 portional to brightness. With the linear option, cameratopam
116 generates an image in which the samples are instead proportional
117 to light intensity.
118 Without -linear, the image maxval is 255, so the image contains
120 one byte per sample. With -linear, the maxval is 65535, so the
121 image contains two bytes per sample.
122 Without -linear, cameratopam uses a 99th percentile white point.
124 With -linear, it doesn't. I don't know what that means.
125
131 411toppm(1), pamflip(1), pam(1),
132
135 cameratopam was new in Netpbm 10.28 (June 2005).
136 It was derived from the program dcraw by Dave Coffin
138 ⟨http://www.cybercom.net/~dcoffin/dcraw/⟩ , by Bryan Henderson in April
139 2005. Bryan replaced the part that generates the Netpbm output image
140 and removed the Adobe Photoshop output function. Bryan changed the
141 command syntax and and made other small changes to make the program
142 consistent with Netpbm. He also split the source code into manageable
143 pieces (dcraw has a single 5000 line source file).
144netpbm documentation 12 April 2005 Cameratopam User Manual(0)