[OS X TeX] Including jpg w/ graphicx

[Morten Høgholm]

On Tue, 22 Nov 2005 22:18:18 +0100, Ross Moore <ross at ics.mq.edu.au> wrote:

> Hi Chris,
>
> On 23/11/2005, at 7:59 AM, Christopher Allen wrote:
>
>>> or it may be the ~ that isn't appropriate, in which case
>>> it need to be the full path:
>>> e.g.
>>>
>>>  \graphicspath{{/Users/rossmoor/Pictures/}}
>>
>> \graphicspath{{Users/callen/Pictures/}} does something. It really  
>> doesn't like the \ before Users,
>
> It is a forward-slash  /   not  backslash  \ .
>
> This works perfectly for me.
> Using ~ does not work at all -- presumably since the shell
> that runs LaTeX doesn't expand the ~ when looking for files.
>
> I'm using TeXshop  with:
>     This is pdfeTeXk, Version 3.141592-1.11b-2.1 (Web2C 7.5.2)
>
> Morten, what are you using, that does (?) give expansion of ~ ?

I'm running on  pdfeTeX, Version 3.141592-1.30.4-2.2 (Web2C 7.5.5) but the  
problem is really that the ~ is expanded all the places where LaTeX looks  
for a file name. Hence the file is never found.

When you're running in pdf-mode, each included image is assigned a csname  
based on its name and path so that pdftex can just refer to the object if  
encountered more than once. Now this is where it goes wrong with an active  
~ with the usual meaning because it contains tokens that are illegal in  
csnames.

> Morten's suggestion of:
>
>    \expandafter\graphicspath\expandafter{\expandafter{\detokenize{~/ 
> Pictures/}}}
>
> requires an appropriate expansion for \detokenize .
> That's rather technical to write, if you don't have it already.

Yes I just to show yet another places where this eTeX primitive turns out  
to be very effective.

> Here's a way to trivially emulate ~ expansion:
>
>
> \documentclass[letterpaper,10pt]{article}
> \usepackage{graphicx}
>
> {%     restrict the re-definition of  ~
> \def~{/Users/rossmoor}
> \xdef\myPictures{{~/Pictures/}}
> }%     returns ~ to normal, retaining  \myPictures
>
> \expandafter\graphicspath\expandafter{\myPictures}

You could also do

\edef\myPictures{{\string~/Pictures/}}
\expandafter\graphicspath\expandafter{\myPictures}

or the equally simple

\catcode`\~=12
\graphicspath{{~/Pictures/}}
\catcode`\~=13

-- 
Morten
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