[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

jos j at w3k.org
Mon Apr 11 23:02:53 CEST 2011

Here is how I got around the black-bar problem:


- jos

At 12:15 PM 4/11/2011, Pat Somerville wrote:
>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.)
>So after receiving your e-mail letter I changed two of those lines to read:
>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
>\int\limits _{-\infty}^{+\infty}
>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.
>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
>>Something to try to see if it will fix your problem.
>>latex2html mailing list
>>latex2html at tug.org
>latex2html mailing list
>latex2html at tug.org

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