(Apologies if I'm posting in the wrong forum . . .)
I have a RPi model B running Raspberrian Wheezy. I've been messing around with an HP HD-2200 webcam trying to get it to take pictures with fswebcam. What I'm finding is that the pics I take are very dark (as you'll see in the sample below). A different make / model camera on the same RPi works fine.
I've seen that pictures are fine when I hook up the HD-2200 camera to my Windows 7 box. Pictures are also fine if I configure motion on the RPi to use the HD-2200. This problem only seems to occur with fswebcam.
I've tried changing the settings of the camera with fswebcam (such as contrast, brightness, and backlight compensation) but that hasn't helped. I can see that my settings are having an effect, but not enough of one. For example, I can set the HD-2200's brightness to -64 (its lowest value) and get a completely black picture,or I can set it to +64 (it maximum) and get a barely visible pic.
The only hint I've seen after a bunch of Google searches is one person who said that when they used the camera with ffmpeg, it needed time to settle - but they went on to say that fswebcam worked just fine with no wait time needed. (I tried various combinations of delays and frame skipping in fswebcam anyway, but that also didn't improve the situation.)
My Pi is running Raspberian Wheezy and it was updated today (6/23). I'm not a Linux newb, but this one has me stumped. Has anyone seen this before? Any hints?
Below is a sample image. You're looking at a shelving unit in my house with a light in the ceiling. However, the only thing that barely shows is the light. In order to eliminate the light causing the camera to close down its iris as the source of my problem, I've also pointed it at other well lit spots, but where there were not ceiling lights. That didn't help either.