[OS X TeX] LaTeXiT & Keynote: color management when printing

Michael S. Hanson mshanson at wesleyan.edu
Tue Sep 25 00:23:58 EDT 2007

	This question may be slightly afield for many folks on this list,  
but since in involves Macs and LaTeX, I hope the rest of you will  
indulge me:

	I am using a 3rd-party Keynote theme along with LaTeXiT for a course  
I am teaching this semester.  The theme has a dark blue background  
with white text;  I use LaTeXiT to produce equations in the same font  
and text color.  Of course, these equations are seen by Keynote as  
embedded PDFs.

	For student versions of the slides (with space to write notes), I  
generate PDFs of each lecture's notes using the Keynote print option  
"Don't print slide background or object fills" -- this, in  
combination with the ColorSync print option to use the "Grey Tone"  
Quartz filter, yields compact versions of the slides that print with  
black text on a white background.

	Except for the equations, that is -- these (naturally) are still  
white and thus rendered "invisible" in the PDFs of the slide handouts  
that the students print prior to lecture.  I could go in and change  
each and every equation manually from a white to a black text color  
(thereby having to maintain two versions of each lecture  
presentation:  the white-on-blue lecture slides and the black-on- 
white handouts).  But I'm hoping for a better alternative.  (The  
slide-to-equation ratio is slightly over 2, but that still leaves 15  
- 30 equations per lecture to modify by hand.)

	I suspect that it should be possible to use CoreImage and/or Quartz  
filters to first "invert" the colors (if that is the right term) so  
that white text -> black text, dark blue background -> light-colored  
background, etc., then filter a second time to create a greyscale  
version of this transformed color scheme.  All via the print dialog,  
or maybe Automator.  Unfortunately, I have not been able to find a  
way to accomplish this objective (and I have neither skills in, nor  
access to, Photoshop or Illustrator, etc.).

	If a LaTeX-based presentation package can do all this, as well as  
manage data chart creation and complex slide transitions and dynamic  
graphics, then I would like to know about it.  However, I am not in a  
position to switch away from Keynote this semester, so suggestions  
for a more direct solution would be greatly appreciated.

                                         -- Mike

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