I recently bought this Samsung printer and in trying it out, I found it did a good job of printing text. However, when I tried printing charts (created in DeltaGraph), it printed these horrible patterns in place of grayscale shading. Is this because it's a non-postscript printer? My Lexmark Optra E310 (a postscript printer) does a fine job on the same charts. Is there a setting or something else one can do to get it to print greyscale shades properly?