Re: Change color of EPS file.

[Aditya Mahajan <adityam@umich.edu>]

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-box/

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
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