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   r.out.ppm converts a GRASS raster map into a PPM image at the pixel
   resolution of the CURRENTLY DEFINED REGION. To get the resolution and
   region settings of the raster map, run:

g.region -p rast=[mapname]

   before running r.out.ppm.

   By default the PPM file created is 24-bit color, rawbits storage. You
   can use the -G flag to force r.out.ppm to output an 8-bit greyscale
   instead. The greyscale conversion uses the NTSC conversion:

Y = .30*Red + .59*Green + .11*Blue

   One pixel is written for each cell value, so if ew_res and ns_res
   differ, the aspect ratio of the resulting image will be off.

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

HINTS

   You can create a PNG image with NULL values represented by a
   transparent background by using the [1]PNG driver with
   [2]GRASS_TRANSPARENT set to TRUE. Alternatively, you can use the
   pnmtopng program from [3]netpbm to do this:

r.out.ppm raster
pnmtopng -transparent white raster.ppm > raster.png

СÐ. ТÐÐÐÐ

   [4]d.out.png
   [5]r.out.ascii
   [6]r.out.mpeg
   [7]r.out.png
   [8]r.out.ppm3
   [9]r.out.tiff

ÐÐТÐÐ

   Bill Brown, UIUC

   Last changed: $Date: 2007-01-28 15:40:16 -0600 (ÐÑ, 28 Ñнв 2007) $

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References

   1. file://localhost/root/tmp/2/fin/pngdriver.html
   2. file://localhost/root/tmp/2/fin/variables.html
   3. http://netpbm.sourceforge.net/
   4. file://localhost/root/tmp/2/fin/d.out.png.html
   5. file://localhost/root/tmp/2/fin/r.out.ascii.html
   6. file://localhost/root/tmp/2/fin/r.out.mpeg.html
   7. file://localhost/root/tmp/2/fin/r.out.png.html
   8. file://localhost/root/tmp/2/fin/r.out.ppm3.html
   9. file://localhost/root/tmp/2/fin/r.out.tiff.html