This driver is Experimental :

Sometimes colors are strange, Automatic Bayer align need some light to work
please move the camera to get more ligth at the top left of your picture.

Good setting can be get when loading the module with:
modprobe spca5xx GRed=217 GBlue=300 GGreen=224 gamma=4 

or using sysfs under 2.6.x
echo "4" > /sys/module/spca5xx/gamma
echo "217" > /sys/module/spca5xx/GRed
should set the gamma parameters to 4 and GRed to 217

read a parameters is easy
cat /sys/module/spca5xx/GRed
Enjoy !!
