[l2h] Black bars under integral signs when the limits of integration are -\infty and +\infty or an algebraic fraction for each of the upper and lower limits

[Pat Somerville]

Thanks, Nasser M. Abbasi, for kindly taking the time to reply to me.  I 
found the file /usr/lib/latex2html/l2hconf.pm.  In it among other lines the 
following lines existed, but not necessarily consecutively:

$DVIPSOPT .=" -E"; (Please notice the period before the equals sign.)

$MATH_SCALE_FACTOR=1.6;

#$DISP_SCALE_FACTOR=1;

So after receiving your e-mail letter I changed two of those lines to read:

$MATH_SCALE_FACTOR=1.8;

$DISP_SCALE_FACTOR=1.0;
.
Results in the .html file produced by LaTeX2HTML: The black line segment 
under the integral sign with the limits of integration having algebraic 
fractions in them was removed.  But the black line segments under integral 
signs produced from the LaTeX commands containing \int\limits 
_{-\infty}^{+\infty} remained.  Those were probably among 27 reported errors 
on 27 images.  I don't know with which images all of the other errors were. 
But I think I remember at least one pnmcrop-related error while latex2html 
was processing my .tex file.

Next I changed to $MATH_SCALE_FACTOR=2.0; in the file l2hconf.pm and 
otherwise did not change any other lines in that file.

Results: There were errors on 27 images.  The black segment under the 
integral sign with algebraic fractional limits returned.

Continuing with the same settings in l2hconf.pm I made a test, .tex file 
containing some commands very similar to

\begin{equation}
\int\limits _{-\infty}^{+\infty}
\end{equation}

and then produced a .html file from that .tex file using a latex2html... 
command.  In the resulting .html file a black line segment existed under the 
integral sign with the limits of positive and negative infinity.  What 
should I do now to try to eliminate the unwanted black line segments under 
some of the integral signs?  Note also that there were also around 20 images 
with errors reported while latex2html attempted to generate them; and in 
detail I don't yet know what obvious problems there were, if any, with the 
associated mathematical symbols associated with the images for which errors 
were reported by LaTeX2HTML.

Pat

--------------------------------------------------
From: "Nasser M. Abbasi" <nma at 12000.org>
Sent: Monday, April 11, 2011 1:37 AM
To: <latex2html at tug.org>
Subject: Re: [l2h] Black bars under integral signs when the limits ofintegrationare -\infty and +\infty or an algebraic fraction	for each of the upper and 
lower limits

> On 4/10/2011 10:29 PM, Pat Somerville wrote:
>
>> Question: What can I do to eliminate all of such examples of unwanted 
>> black bars
>>  underneath some of the integral signs?
>>
>
> This sounds like the same known problem which was mentioned here some time 
> ago?
>
> Check  http://12000.org/my_notes/l2hwin/index.htm  and look for
>
> item (2) under "some errors and possible solutions"
>
> Here it is:
>
> "some of the bitmap images produced for the mathematics in the
> document have a solid dark bar, usually at the bottom or the
> side of the bitmap image. The reason for this is unknown.
> But I found by trial and error that setting the following
> values in my l2hconf.pm eliminated most if not all of these
>
> $MATH_SCALE_FACTOR = 1.8;
> $DISP_SCALE_FACTOR = 1.0;
>
> "
>
> Something to try to see if it will fix your problem.
>
> --Nasser
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