pngout
Increase some compression Also corrects some warnings being reported by libpng (via SDL_image); h/t Tim Dickson, closes https://sourceforge.net/p/tuxpaint/bugs/252/
Suitable for simple 'pixel art'. Draws 8x8 pixel rectangles on a grid across the canvas. Sound effect created via a small Atari BASIC program sampled in the open source 'Atari800' emulator (emulating the POKEY sound chip), and trimmed in Audacity.