On Sat, Mar 27, 2021 at 11:22:14PM +0100, Ralf Hemmecke wrote:
> > This is hidden in C part: hyperdoc puts 'write' command after
> > graphic commands.  Required formats are specified as part of
> > that 'write' command.
> 
> Thank you. It works, but I must say, I don't (yet) like the result.
> 
> Compare the book from
> 
>   http://fricas.github.io/book.pdf
> 
> with the one without ImageMagick
> 
>   http://hemmecke.org/fricas/book.pdf
> 
> Issues that I realized with the new method
> (compare for example pp. 298)
> 
> - no caption (compare for example page 298)
> - 3d objects look brighter
> - 3d meshes are thinner

Hmm, on my machine 3D Postscript output that I see looks very
similar to .xpm and certainly no worse.

> - 2d graphics is only black/white

This is known problem, I wrote about this.  In 2007 looked at the
issue, but other things kept me busy so I did not come back...

> - 2d graphics does not fit current size

AFAICS this is very general problem: graphics tries to choose
resonable size, but without explicit request size may be wrong.

-- 
                              Waldek Hebisch

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