W2H: troubleshooting tips for PS to GIF conversion

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Here is a description how you can redo in a shell the conversion steps W2H is doing:

1. create a postscript file:
   
   • GCG environment:
     start a shell with a GCG session
     % postscript ColorScript-100 out.ps
     % plottest -default
     Now you should have a color postscript file (out.ps).
   • EMBOSS environment:
     create a postscript (PS) output with an EMBOSS application
     (e.g. plotorf -graph=ps -goutfile=out)
     Now you should have a postscript file (out.ps).
2. % which gs
   Is this the same gs you're using for W2H ($PATH variable)?
3. % gs -q -sDEVICE=ppmraw -r100 -dNOPAUSE -sOutputFile=- - < out.ps > out.ppm
   This converts the postscript file into a 100 DPI PPM file.
4. Display this PPM file, using a viewer like:
   % xv out.ppm
   or
   % display out.ppm
5. % which convert
   Is this the same convert you've configured in W2H's Cfg.pl ($PSCONVERT)?
6. % convert -rotate 270 PPM:- GIF:- < out.ppm > out.gif
   This converts the PPM file into a GIF file.
7. Display this GIF file, using a viewer like:
   % xv out.gif
8. And now do the 2 conversion steps in one go:
   % convert -rotate 270 -density 100 PS:- GIF:- < out.ps > out2.gif
   This converts the PS file via a temporary PPM file into a GIF file.
9. Display this GIF file, using a viewer like:
   % xv out2.gif

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