If you want to create a PNG on your Windows PC, you already have all the tools you need. The easiest method is via the Paint program, which is pre-installed on every Windows PC. It may seem simple, ...

I need to convert some images (mostly jpg, a few other formats) into raw RGB colormaps, and ultimately into a .h file that I can compile into a C program. The .h is something like I need RGB 565, 666, ...