This is true, but BMP became a bit of a kitchen-sink format, supporting all sorts of pixel formats, and optionally, compression.
i.e. you'd still want to pick a subset to implement. To be honest, you're probably right - BMP would be more sensible starting point, but I'm interested to see how far PNG can be pushed.
i.e. you'd still want to pick a subset to implement. To be honest, you're probably right - BMP would be more sensible starting point, but I'm interested to see how far PNG can be pushed.