C: adding text to images

[Lennart Sorensen]

On Wed, Dec 22, 2010 at 06:15:03PM -0500, Giles Orr wrote:
> 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?

libgd.  Has interfaces for most scripting languages, and of course is
a C library.  It can generate graphics, as well as compose graphics and
text very nicely.

-- 
Len Sorensen
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