Some settings only take effect during a call. So, call a friend and try adjusting some of the settings. I'm not sure what will be best for your camera. Maybe try reducing Backlight Comp, increasing Contrast. Try unselecting Auto box for White Balance. You could try clicking "Default", to reset, though that won't cover everything. Also click the second tab in that panel, Camera Control, and compare settings. Maybe uncheck Low Light Compensation or Exposure or adjust slider. Just in case, does your webcam have a little sliding cover that might be covering the lens? 
I have a Vostro 7500 running Windows 10 with an integrated webcam. The webcam has suddenly stopped working. I've been through all the suggested fixes on the video - updating the drivers and the BIOS, checking that the camera app is enabled, checking that the camera is enabled in the BIOS, checking that the camera is allowing in Norton 360, etc - but all to no avail. I have an external webcam and am able to plug that in successfully to get video when using Skype or Zoom but when I try to use the integrated webcam I just a blank black screen. Does anyone have any further suggestions?
Integrated webcam not working for Vostro 7500