Header-only easy to use libraries for image reading / writing / resizing

[michelerenzullo]

There are some simple, easy-to-use, well-supported C header-only libraries for image loading, writing and resizing.
It's always better use the original libpng or libjpeg-turbo but for testing, research, simplicity purposes it's a good choice. I used them often. We love OpenCV but as I said before is too powerful for small projects that could be written without his help.

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