Firebrand says I can use

screenshot_type png

but if I do that and try to make a screenshot debug.txt says

Log: Bad screenshot type

Syntax and in-game key binding is right: if I set to pcx instead of png, it writes a PCX file. So what types can I actually set? I found nothing in the wiki.

Currently pcx and tga.

Please add a format that hasn't been obsolete since the 1990s. <!-- s;) --><img src="{SMILIES_PATH}/icon_wink.gif" alt=";)" title="Wink" /><!-- s;) -->