I have been using grafx2 now for a little while and got used to the basics of the program. I love it! There is something I have not been able to setup correctly - Palettes. I know how to load a palette, but if I edit a palette, it gets really confusing.
So, let's say I load grafx2 with the default palette. This is 256 colors I think. 2 colors have a rectangle around them. 1 is transparent black and the other is white. I would like to know a couple of things about this if someone is familiar with it.

1. How can I switch to 16 color mode and if I do, out of the 256 colors, which turn out to be the 16 colors that get saved to the file? What happens to the transparent color?

2. When loading my image into other programs, the transparent part of the image is black (using default grafx2 palette). How can I ensure my transparent color is saved? I only use png or gif.

The last question is off-topic sort of. Is there a large palette repository online where I can look at other palettes? The grafx2 website has some cool palettes, but I thought I would look for game or image specific palettes if I can find some.

Any help on any of these questions would be nice.