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gl-image-overlay
This is a small program that loads an image and uses the GPU to apply a text overlay to it and save that as a new image.
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ImageMagick can do anything you need with images, including writing text, and has a couple of C APIs you can use, as well as API's for many other languages.
Well, you mentioned that you're a beginner, and this is quite a difficult project to tackle, but it's doable. Definitely try the stb libraries, notably stb_image for loading images, stb_truetype for rasterizing text, and stb_image_write for writing images. Again, it's a difficult project for a beginner, but it's not impossible.