On Oct 25, 2013, at 9:09 AM, hwit...@gmail.com wrote:

> GIMP also shows an RGB model for the resulting pdf file. 
> Also is this mention of pixel resultion of 72x72 correct or useful?
>     I tried to get a 300 dpi resolution for output.

ConTeXt just typesets text, places graphics and runs graphic creation routines 
which have been grafted in to TeX as libraries.

The only things which should result in pixel information are:

 - graphics --- you're in control of their settings when they're created
 - internal graphic creation --- at one point in time there were issues w/ 
transparency, but these were resolved AFAIR

So, check your settings for any graphics you're placing, and for those which 
you are creating w/in ConTeXt.

Neither of the tools you mentioned are suited for checking pre-press-readiness 
of a file. 

Multivalent has some facilities for validating a file: 
http://multivalent.sourceforge.net/
as does qpdf: http://qpdf.sourceforge.net/

There are free on-line tools: 
http://www.pdf-tools.com/pdf/validate-pdfa-online.aspx

Lots of commercial options such as Adobe Acrobat, Enfocus PitStop, 
http://www.fixmyprintfile.com/, &c. List here: 
http://www.pdfxreport.com/doku.php?id=en:tools

If you can make a valid PDF/X file, you may find a useful tool here: 
http://www.pdfxreport.com/doku.php?id=en:faq

William

-- 
William Adams
senior graphic designer
Fry Communications
Sphinx of black quartz, judge my vow.

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