%  Sample setup to overlay all pages on one in the output and supress pure white fills

% advise PStill to overlay all pages

define pdf_page_setup(pagenum) {
	setupPage(0,0,0.0,1.0,1.0,1);	
}

% supress pure white fills, needs PStill 1.72.15 as of 17.01.2008 to run (or newer)

% Do nothing for Stroked lines (output unchanged)

define interceptStroke() {

}

% Do nothing for Images (output unchanged)

define interceptImage() {

}

% Catch fills and check for color, disable output if white

define interceptEOFill() {
	variable colorspace;
	variable cyan, yellow, magenta, black;

	colorspace = currentColorspace();

	(cyan,magenta,yellow,black) = currentCMYKColor();
	
	if (colorspace < 4) {  	 % we check DEVICEGRAY,RGB and CMYK Colorspaces
		if ((black + cyan + magenta + yellow) < 0.01) {	% only for pure white
			suppressOutput();  % disable output
		}
	}
}

define interceptFill() {
	variable colorspace;
	variable cyan, yellow, magenta, black;

	colorspace = currentColorspace();

	(cyan,magenta,yellow,black) = currentCMYKColor();
	
	if (colorspace < 4) {  	 % we check DEVICEGRAY,RGB and CMYK Colorspaces
		if ((black + cyan + magenta + yellow) < 0.01) {	% only for pure white
			suppressOutput();  % disable output
		}
	}
}