Spent the whole day today trying to get a nice picture through OpenCV.  Can't get it to work.  It looks OK in Guvcview but only if I toggle the resolution and wiggle the  Brightness control !  In addition it works only on high (1920x1080) and medium (1280x720) resolutions.  Maybe I should cross my fingers, get a rabbit's foot for good luck and spit over my left shoulder?  Can't even see the dots in VLC with which I took that nice snapshot yesterday any more!  What is wrong with the world? Everything is broken!  But hey, look on the bright side, we got lots of pretty buttons on the web - the ultimate achievement of this civilization :)