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NAMEr.out.ppm - Converts a GRASS raster map to a PPM image file.KEYWORDSraster, export, outputSYNOPSISr.out.ppmr.out.ppm --help r.out.ppm [-gh] input=name [output=name] [--overwrite] [--help] [--verbose] [--quiet] [--ui] Flags:
Parameters:
DESCRIPTIONr.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 raster=[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. NOTESA 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.)HINTSYou can create a PNG image with NULL values represented by a transparent background by using the PNG driver with GRASS_RENDER_TRANSPARENT set to TRUE. Alternatively, you can use the pnmtopng program from netpbm to do this:r.out.ppm raster pnmtopng -transparent white raster.ppm > raster.png SEE ALSOd.out.file, r.out.ascii, r.out.gdal, r.out.mpeg, r.out.png, r.out.ppm3AUTHORBill Brown, UIUCSOURCE CODEAvailable at: r.out.ppm source code (history)Main index | Raster index | Topics index | Keywords index | Graphical index | Full index © 2003-2021 GRASS Development Team, GRASS GIS 7.8.6 Reference Manual
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