To export graphics, modify them, and then continue the conversion using the modified graphics, you must run dcl twice. For the first step, specify target option -t dcl, which tells the filter to stop after producing the DCL file and exported graphics files. For the second step, specify the .dcl file as the source; you do not need source option -s dcl, because the filter can tell both from the extension on the DCL file and from its opening bytes that the source file is in DCL format instead of MIF.