Re: [hlx] images truncated by makeimage

[Jay B. <bel...@tr...>]

> When I try to use the image environment etc to turn a latex structure
> into a png image, I find that I am losing the bottom third (or so) of
> the image. (This does not appear to happen when converting an inserted
> .eps file.) I have attached the stripped down tex file, the resulting
> .makeimage file and .ps file. The conversion from the .ps file to the
> .png file is perfect. I am also attaching the "correct" .png file that I
> have created by editing the .makeimage file on the fly by increasing the
> y-coordinate of the -T option to dvips.
>
> Can anyone help, please?

I think the part of the image you lose is the part below the baseline.
I think (someone feel free to correct me) the problem is that when
hyperlatex computes the image dimensions, it doesn't include the
depth.  The relevant part of hyperlatex.sty is

 \if@makeimages
 \typeout{******************************************}
 \typeout{* Making bitmaps from Hyperlatex source! *}
 \typeout{******************************************}
 \newwrite\@makeimagecmds
 \immediate\openout\@makeimagecmds=\jobname.makeimage
 \newbox\@imagebox
 \newcount\@imagecount\@imagecount=10000
 \def\@@@@image{\setbox\@imagebox=\vbox\bgroup\tex}
 \def\endimage{\egroup
   {\global\advance\@imagecount by 1\count0=\@imagecount
     \immediate\write\@makeimagecmds{dvips\space -f\space -p\space
       \the\@imagecount\space -n\space 1\space -D\space \image@dpi\space
       -T\the\wd\@imagebox,\the\ht\@imagebox\space-O-72bp,-72bp\space
       \jobname.dvi\space>\space\im...@na...^^J%
       ps2image\space -res\space \image@resolution\space \im...@na...%
       \space \Hlx@directory/\image@name.\@imagetype^^J}
     \shipout\copy\@imagebox}\unvbox\@imagebox}
 \else
 \def\@@@@image{\tex}
 \def\endimage{}
 \fi

One quick way to fix this is to add a blank line at the bottom of the
image enviroment when \makeimage is defined:
Change the
 \def\endimage{\egroup
to
 \def\endimage{\par~\egroup

Another (more proper?) way would be to put in the correct total height
to begin with.  I don't know if there's a total height function
corresponding to the \ht height function, but the height and depth
could be added in a new register.  Add the line

 \newdimen\@imageheight

right after the

 \newcount\@imagecount\@imagecount=10000

line.  Then replace the definition of \endimage with

 \def\endimage{\egroup
   {\global\advance\@imagecount by 1\count0=\@imagecount
     \@imageheight=\ht\@imagebox
     \advance\@imageheight by \dp\@imagebox
     \immediate\write\@makeimagecmds{dvips\space -f\space -p\space
       \the\@imagecount\space -n\space 1\space -D\space \image@dpi\space
       -T\the\wd\@imagebox,\the\@imageheight\space-O-72bp,-72bp\space
       \jobname.dvi\space>\space\im...@na...^^J%
       ps2image\space -res\space \image@resolution\space \im...@na...%
       \space \Hlx@directory/\image@name.\@imagetype^^J}
     \shipout\copy\@imagebox}\unvbox\@imagebox}


Jay