Outputting PDFs with inverted colors

[appscaptain]

How can you build MacReFlower so it outputs pdfs with inverted colors (for nighttime reading)?

Trying adding "@"-neg", in MRFAppDelegate.m under "NSArray* defaultOptions = [NSArray arrayWithObjects:" but it didn't build a version that outputs inverted pdfs. How do you change the parameters of the built version?

P.S. Got the option from: http://www.willus.com/k2pdfopt/help/options.shtml