I am currently typesetting a book in ConTeXt and have been wondering how to get correct PDF Boxes when creating a PDF/X file for printing. According to a page on Context Garden this should be possible with current versions (I'm using 2017.04.27); alas, I noticed that especially the TrimBox doesn't seem to be exported correctly.
Please consider this MWE:
\setuplayout [location=middle, width=middle, height=middle, cropoffset=3mm, trimoffset=6mm, bleedoffset=9mm ] \starttext \setuppapersize[A4][SRA4] \input tufte \stoptext
(Note that I used these definitions for the parameters
bleedoffset just for testing.) The file that is created when running context looks like this, when opened in Acrobat Pro:
Notice the green line: This is only visible, when activating "Show art, trim and bleed boxes" in the preferences and represents the TrimBox (normally equal to the CropBox). This should be showing the actual cropped page size (A4). In addition, although largely irrelevant in actual printing, there should also be the BleedBox (page size plus bleed), but there doesn't seem to be one in this PDF. What's more, the parameters specified don't seem to have any effect, at all. What I'm seeing is the paper size SRA4 give by the command
In contrast, here's a PDF file created by Adobe InDesign:
Notice again the green line: This time it is correctly positioned (A4) and there's also a blue line that represents the BleedBox.
Can anyone offer any help? Is this a bug? Or am I missing some switch?
All help would be much appreciated.