[GRASS-dev] animation missing pnmscale
michael.barton at asu.edu
Mon Sep 10 12:57:47 EDT 2007
On 9/9/07 5:18 PM, "Glynn Clements" <glynn at gclements.plus.com> wrote:
> William Kyngesburye wrote:
>> These are the ones I've found so far (searching for 'netpbm'):
>> ppmtompeg: r.out.mpeg
> This is bound to require some kind of external tool, be it ppmtompeg,
> mencoder (from mplayer), etc.
>> pngtopnm: d.out.gpsdrive
> This is gratuitous. The PNG file is generated by the PNG driver, which
> can generate PPM files by itself. Moreover, the ability to generate
> PPM files is unconditional, while generating PNG files is optional
> (using --without-png will disable it). The "PNG driver" name is a
> historical artifact.
>> pnmtojpeg: d.out.gpsdrive
> This will require an external utility, but "cjpeg" would have been a
> better choice. "cjpeg" is built and installed along with libjpeg,
> which pnmtojpeg requires. IOW, if you have pnmtojpeg, you already have
> cjpeg, but the reverse isn't true.
>> pnmscale: xganim.tcl
> xganim.tcl was something I hacked together in an hour to determine the
> feasibility of replacing xganim. AFAICT, it isn't actually part of
> GRASS (yet).
This won't need pnmscale. Glynn's solution to do scaling via adjusting the
resolution prior to running r.out.pnm works fine.
Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics and Complexity
Arizona State University
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