The problem with transparencies comes from the fact that PDF Converter is similar to Postscript printers but is not really a Postscript printer. So it is in between two worlds: raster printer (e.g. PCL) and Postscript.
The "fix" for transparent gifs is different depending on the application from which you are printing. From most applications, you can fix th issue by setting the Postscript Simulation option in PDF Converter. This works wll with MS Office applications for example. It basically tricks the application into changing the rendering instructions so that they are compatible with PDF and PS printers. This option can be set either from the Advanced tab or programmatically through the API. Both options are described in our documentation.
Some applications are also capable of sending gif ad png images directly to the printer without going through the Windows GDI layer. Starting with PDF Converter 22.214.171.124, we added support for PNG images that have a transparency or alpha channel. So outputting this type of images became more accurate efficient. So the "fix" might be in updating to the latest printer driver that is now on our web site.
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