[NTG-context] how to get an image form flowchart

Hello,everybody, I have a problem while using context to create some flowcharts. The beginning of my tex source file looks like: \setupoutput[pdftex] \usemodule[chart] Naturally I got a flowchart in pdf version. But a pdf version flowchart is not suitable for inserting into a paper or a report. Then I utilized software to convert it from pdf format into some other imgage formats. But none of them was satisfied. I wonder how can I direct get a flowchart in some imgage formats (e.g. png, jpg) from the source tex file. Are there some tricks in the settings of the tex source file? Thanks in advance! Best regards 　　　　　　　　wei jm 　　　　　　　　wei@uni-duisburg.de 　　　　　　　　　　2004-01-20