Correct Saving procedure

[♔DoomBunny666♔]

So I have completed a retexture, but when I go to save it am presented with a myriad of options which do I choose

for

Compression
Format

I am using Gimp.

[Archealos]

So I have completed a retexture, but when I go to save it am presented with a myriad of options which do I choose

for

Compression
Format

I am using Gimp.

BC3/DXT5

and generate mitmaps checked

[♔DoomBunny666♔]

Cheers very helpful.