chun0216,

Thanks for trying out FCam.

Unfortunately, the N900 hardware can only provide two formats for output, either RAW or UYVY. UYVY is what FCamera (and the default camera app) uses for the viewfinder.

If you want RGB24, you'll either have to convert UYVY to RGB yourself, or use the FCam Demosaic function to convert RAW data to RGB24. Note that you can't currently get 640x480 RAW with FCam, but you can get 1280x1024 RAW, at the same rate as 640x480.