C: adding text to images

[Giles Orr]

A friend of mine recently sent me the following question.  I hadn't
any idea, and got his approval to post here.  Can anyone assist?

Question:

Background: I'm looking at satellite data. I wrote a program in C that
does the following: Slurp up raster data in HDF format, feed the data
to a program that runs something called iterated conditional modes,
then writes out the raster data in TIFF.

Problem: How do I make a caption with a legend and some text in it?
I really don't want to do this pixel-by-pixel in the raster data. I was
hoping for an easy C function like:

add_text (x_loc, y_loc, size, text_string);

...that would then make the caption in the TIFF.

I have looked around, and will continue to do so, but haven't found
anything I like yet. I know Gimp can do this, but I don't want to use
the GUI: I'd like to use this in my C program.

Any suggestions?

-- 
Giles
http://www.gilesorr.com/
gilesorr-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org
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