I know you can take a screenshot with a USB gecko, but would it be possible to take screenshots to your SD card?
phew... not so easy actually.. to take screenshots WiiRd does the following:
1. Pause game
2. dumps memory of video registers and inspect it
--> extracts: how large actual picture data is, where it starts etc.
3. dumps the actual picture data
4. decodes it to RGB (normally YUV)
5. fixes up data (for example 480p screenshots would be messed up now, they'll be fixed now)
6. store as BMP/JPEG/PNG
to store the SD card of course JPEG and PNG are impossible.. for the rest.. all screenshot processing is currently done completely on PC side.. that would have to be changed I fear..
Ahh, I see. I wasn't sure if the image decoding was done PC side, or through GeckoOS.