1r.out.ppm(1)                  Grass User's Manual                 r.out.ppm(1)
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NAME

6       r.out.ppm   -  Converts  a  GRASS raster map to a PPM image file at the
7       pixel resolution of the currently defined region.
8

KEYWORDS

10       raster, export
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SYNOPSIS

13       r.out.ppm
14       r.out.ppm help
15       r.out.ppm [-qG] input=name  [output=name]   [--verbose]  [--quiet]
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17   Flags:
18       -q
19           Run quietly
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21       -G
22           Output greyscale instead of color
23
24       --verbose
25           Verbose module output
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27       --quiet
28           Quiet module output
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30   Parameters:
31       input=name
32           Name of input raster map
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34       output=name
35           Name for new PPM file (use '-' for stdout)
36           Default: .ppm
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DESCRIPTION

39       r.out.ppm converts a GRASS raster map into a PPM  image  at  the  pixel
40       resolution  of the CURRENTLY DEFINED REGION.  To get the resolution and
41       region settings of the raster map, run:
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43
44       g.region -p rast=[mapname]
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46
47       before running r.out.ppm.
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49       By default the PPM file created is 24-bit color, rawbits storage.   You
50       can  use  the  -G  flag to force r.out.ppm to output an 8-bit greyscale
51       instead.  The greyscale conversion uses the NTSC conversion:
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53
54       Y = .30*Red + .59*Green + .11*Blue
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56
57       One pixel is written for each cell value, so if ew_res and ns_res  dif‐
58       fer, the aspect ratio of the resulting image will be off.
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NOTES

61       A  few ppm file comments are written: the name of the GRASS raster map,
62       resolution, etc.  Although these are perfectly legal, I've found one PD
63       image  utility  that  chokes  on them, so if you need a commentless PPM
64       file, use 'out=- > outfile.ppm'. (When sending  output  to  stdout,  no
65       comments are written.)
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HINTS

68       You  can create a PNG image with NULL values represented by a transpar‐
69       ent background by using the PNG driver with  GRASS_TRANSPARENT  set  to
70       TRUE.   Alternatively,  you can use the pnmtopng program from netpbm to
71       do this:
72       r.out.ppm raster
73       pnmtopng -transparent white raster.ppm > raster.png
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75

SEE ALSO

77       d.out.png
78       r.out.ascii
79       r.out.mpeg
80       r.out.png
81       r.out.ppm3
82       r.out.tiff
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AUTHOR

85       Bill Brown, UIUC
86
87       Last changed: $Date: 2007-01-28 22:40:16 +0100 (Sun, 28 Jan 2007) $
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89       Full index
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91       © 2003-2008 GRASS Development Team
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95GRASS 6.3.0                                                       r.out.ppm(1)
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