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On Fri, 14 Sep 2012, Troy Henderson wrote:
I put together this little utility for converting a color EPS/PDF/SVG to grayscale.
http://www.tlhiv.org/grayscale/
Selecting "invert" swaps colors from white to black and black to white. So, using a black/white graphic on a transparent background should transform it to a white/black graphic on a transparent background.
Testing is certainly necessary.
Interesting. At some stage I might revive the webfilter branch of the filler module so that such services can be accessed from within ConTeXt. See the following post for details: http://randomdeterminism.wordpress.com/2010/08/12/using-filters-outside-the-... In case anyone is interested, this blog post was talking about code available at https://raw.github.com/adityam/filter/web/t-filter.tex https://raw.github.com/adityam/filter/web/t-filter.lua At some stage I decided to delete these features from the filter module and move it to a separate module. The code is available at https://github.com/adityam/context-webfilter but I haven't used it for about 2 years, and given all the changes in the internal namespace, I doubt it will run without modifications. Nonetheless, the idea is that a user can use such services using: \definewebfilter[grayscaleimage] [prefix={http://www.tlhiv.org/grayscale}, method=POST, ... some other options .... ] and then use \grayscaleimage{local-image.eps} This will call the web-service and cache the result. Aditya