png++

C++ wrapper library for reading and writing PNG images

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C++ wrapper for libpng library

load a PNG image file in C++ code

$ #include <png++/png.hpp>
png::image<png::rgb_pixel> image("input.png");

write pixel data to a PNG file

$ #include <png++/png.hpp>
png::image<png::rgb_pixel> image(100, 100);
image.write("output.png");

read and modify individual pixel values in PNG

$ #include <png++/png.hpp>
png::image<png::rgb_pixel> img("photo.png");
img[50][50] = png::rgb_pixel(255, 0, 0);
img.write("modified.png");

work with PNG images with alpha transparency

$ #include <png++/png.hpp>
png::image<png::rgba_pixel> image("transparent.png");
auto pixel = image[0][0];
auto alpha = pixel.alpha;

get PNG image dimensions and properties

$ #include <png++/png.hpp>
png::image<png::rgb_pixel> img("image.png");
int width = img.get_width();
int height = img.get_height();