_SaveImage less then 32BPP

[Petr]

Thanks Petr,
Second one works good.
But anyhow it is a one time generate PNG to print at 1200dpi (highest quality with fine lines)

Still wondering why _SaveImage always reverts to 32BPP instead of taking image mode-property into account

I assume it's because of speed. It depends on the library being used, as some can't handle anything less than 24/32-bit images. That’s why they convert them to 32-bit. I’m basing this on my experience with BMP, which also doesn't support everything it potentially could. However, I’ve released my own versions where that support is included.