<pre>The original version is from: <a class="moz-txt-link-freetext" href="http://list.cs.brown.edu/pipermail/plt-scheme/2006-November/015277.html">http://list.cs.brown.edu/pipermail/plt-scheme/2006-November/015277.html </a> I improve the model: all command parameters are parameterized variables 1. those generated png file are cached, when tex2im is called, it searches the cache first! 2. A pop up window can tell where is wrong when compiling latex file failed Sample code: (define math-fg-color "MidnightBlue") (define math-bg-color "white") (define code-fg-color "PineGreen") (define code-bg-color "white") (define question-text-color "red") (define bigger-resolution "200x200") (define (math-picture file) (size-in-pixels (bitmap (parameterize ([tex2im::fgcolor math-fg-color] [tex2im::bgcolor math-bg-color]) (tex2im file ))))) (define (big-math-picture file) (size-in-pixels (bitmap (parameterize ([tex2im::fgcolor math-fg-color] [tex2im::bgcolor math-bg-color] [tex2im::res bigger-resolution]) (tex2im file ))))) (define (code-picture file) (size-in-pixels (page-para (bitmap (parameterize ([tex2im::fgcolor math-fg-color] [tex2im::bgcolor math-bg-color]) (tex2im file )))))) (math-picture tex-file6) (math-picture " \\begin{eqnarray*} eval(let \\; x=4\\;in\\;(add1\\; x))&=&5\\\\ eval(fun\\;x.(add1\\;x))&=&procedure\\\\ eval((fun\\;x.(x\\;x))(fun\\;x.(x\\;x)))&=&undefined\\\\ \\end{eqnarray*}")) Any problems please let me know Suggestions are very welcome. thanks YuGang </pre>