What’s  Page12C?

Page12C converts the ripped imposition (1-bit TIFF format) to composite contone TIFF, then separate the contone TIFF imposition to original page order, so you can easily print out with digital color proof printing equipment. 

Limited to the printing size(A3 or 11”x 17”), ripped imposition can’t print out with digital color proofing. Most of printing factory use these two ways to confirm the proofing: 
One way is to print the imposition with large format printer, cut and post them to make a book. This way can be inconvenient and costly. The other way is to print color proof during preRIP, it’s easier and faster, but errors might occur after postRIP. 

Page12C can solve these problems, converts the ripped imposition to composite contone TIFF, separate the imposition to the actual page size, it’s a real postRIP proofing.