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From: Taco Hoekwater <taco@elvenkind.com>
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Subject: Re: Problem with bit maps with ConTeXt under MikTeX (works fine using LaTeX)
Date: Wed, 7 Nov 2001 16:47:59 +0100
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Hi,

> I want to use something that Yap can display because of the improved 
> edit cycle with its support for forward and reverse lookups. What I want 
Right, I see. Available paths using context:

1)  use png file and texexec --pdf, preview in acroread

2) you can try my (very ugly, more like a proof of concept) hack with bmp files and yap:

%% start of file
\unprotect
\definefileinsertion{tr}{bmp}#1#2#3#4#5#6#7#8#9%
  {\scratchdimen\@@efbreedte 
   \ScaledPointsToWholeBigPoints{\number\scratchdimen}\width
   \scratchdimen\@@efhoogte 
   \ScaledPointsToWholeBigPoints{\number\scratchdimen}\height
   \vbox to 0pt{\kern -\@@efhoogte\hbox{%
     \ifnum\height = 0
       \ifnum\width = 0 \special{em: graph #1}%
       \else            \special{em: graph #1,\width bp}%
       \fi
     \else 
      \special{em: graph #1,\width bp,\height bp}%
     \fi%
   }\vss}}
\protect
%% 
\starttext

\externalfigure
    [sample.bmp]
    [width=2in, height=1in,scale=1000,method=bmp]
\stoptext
%% End of file

Perhaps Hans can derive something cleaner.

1. Considerations: never bother looking into the bmp for it's size, just use specified values always (as latex does)
2. I don't understand why I need the 'scale=1000'

-- 
groeten,

Taco