Hi,
My method first was to produce .ps then convert using
Imagemagick to .gif. But it is very slow for a lot of
images. I am now using the following method, which is
at least twice as fast:
1- I produce maps using ngcm NCL driver
2- Convert to gif using : ncgm2gif -res 1362x1362
file.ncgm
3- Then, scale back the image using:
convert -interlace none -geometry 600x600 file.gif
filesm.gif
4- Crop the whitespace:
mogrify -crop 0x0 filesm.gif
This is much faster than going through postscript. I
am also producing, with the same ncgm file, a smaller
version for panels output, e.g. using:
ncgm2gif -res 862x862 file.ncgm
and then
convert -interlace none -geometry 380x380 file.gif
filevsm.gif
Examples:
http://meteocentre.com/models/gfs_long_amer_00/
http://meteocentre.com/models/gfs_long_amer_00/gfs_00_panel.gif
Cheers,
Christian Pagé
UQAM
--- Hauss Reinbold <reinbold@dri.edu> a écrit :
> Hello all,
>
> I'm working on taking model output on an operational
> basis and
> displaying it on the web. If I'm using NCL to
> create the graphics
> (850mb height maps, etc.), what is the best and
> fastest method to get
> it to a gif or jpg format? I use Imagemagick's
> convert to go from
> postscript to jpg or gif, but the process is slow
> (at least at the
> density I would like the graphics at) and using
> going the ngcm through
> ctrans route yields a graphics quality I am not
> happy with. I would
> like post-processing to take less time than the
> model run, but I don't
> want to sacrifice image quality too much. I know
> this may not be
> possible, but I am determined to get the fastest
> conversion time
> possible with the highest possible image quality. I
> have done a lot of
> research on this already, but I'm curious as to what
> some of you would
> suggest as the fastest way to get from NCL
> postscript plot to jpg or
> gif without sacrificing image quality. Obviously
> this is a somewhat
> subjective assessment. I realize this may be a
> little off-topic as
> it's not strictly NCL related, but I would
> appreciate any advice any of
> you might have. Thanks.
>
> Hauss Reinbold
>
> _______________________________________________
> ncl-talk mailing list
> ncl-talk@ucar.edu
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
=====
------------
Christian Pagé
__________________________________________________________
Lèche-vitrine ou lèche-écran ?
magasinage.yahoo.ca
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