If you are using nodes to extract a functioning mask from a color map, you won't need grayscale maps for those. In general, avoid any maps you can do without, for smaller zip files and to demand less resources from the user's computer.

I generally prefer jpgs. Photoshop does a great job at compressing them with very few quality loss. I usually set my maps at a quality 8 in Photoshop.

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Feel free to call me Ohki!

Poser Pro 11, Poser 12 and Poser 13, Windows 10, Superfly junkie. My units are milimeters.

Persephone (the computer): AMD Ryzen 9 5900x, RTX 3070 GPU, 96gb ram.