Our PDF2TIFF utility "translates" the PDF code to raster instructions 
and is therefore sensitive to an absolute correct syntax. 

Our SimpleP2T utility converts PDF's to TIFFS using our own image 
driver with its own "rasterizer" to display the PDF and capture the 
displayed image to a TIFF file.  This way of "direct image conversion" 
is somehow slower, needs more memory but in the most cases avoids translation 
problems.