# [OS X TeX] A bug of Apple pdf routines that affects to TeX ?

Bernhard Barkow bb at creativeeyes.at
Fri Jan 9 03:15:50 EST 2009

On 2009-01-08, at 20:00, Herbert Schulz wrote:
> On Jan 8, 2009, at 10:27 AM, Juan Luis Varona wrote:
>> I think that I have found an irritating bug of Apple pdf routines
>> that affects to TeX in a Mac.
>> I send a example that explain the problem.
>>
>>
>> Juan Luis Varona
>>
>> \documentclass[12pt]{article}
>>
>> \title{I think that this shows a bug of Apple pdf routines that
>> affects to TeX}
>>
>> \author{Juan Luis Varona}
>> \date{}
>>
>> \begin{document}
>>
>> \maketitle
>>
>> Compare the alignement of the third symbol $|$'' in the following
>> formulas with~$+$'' and~$-$'':
>>
>> $|x| + |y|$
>>
>> $|x| - |y|$
>>
>> In the pdf generated with pdflatex, it is very well aligned.
>> But the alignment fails after~$-$'' IF YOU PRINT with the Apple
>> Preview
>> (both in the paper and in a pdf in the hard disk), and also if,
>> with TeXShop,
>> you print or you select the formulas and drag it to the hard disk
>> (as a pdf).
>> I do not know the reason, but the~$|$'' is too close to the~$- >>$'' and
>> too far to the~$-$''.
>>
>> No similar problem arises printing (in a paper) with Adobe Reader.
>>
>> I do not know where to report this problem (or if it is already
>> known).
>> Can some guru in the list to help?
>>
>> I have checked the problem with Mac OS X 10.5.2 to 10.5.6
>> (I do not have older Macs).
>>
> I can confirm having this problem with the pdf file produced with
> pdflatex. Printing via Apple's PDF API adds space between that | and
> the following y even though the pdf display is correct. It may be a
> problem (Apple had a bad pdf printing problem in early versions of
> Leopard) with the printer interface. Since Adobe uses their own
> printer interface it prints perfectly there.

Maybe a similar issue: using "cmbright" fonts (regular, not bold)
results in the i's and l's (ell) printed as thin vertical lines when
I have not investigated this so far with other fonts, but I will try…

Bernhard

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