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This document is located on HP's web site concerning purple tint on certain web-cams. This document pertains to certain HP Notebook PCs with Windows 7. When using an HP ENVY 15 notebook PC webcam in low light conditions, images on the webcam may have a purple tint.The ENVY 15 Series webcams include night vision technology that is designed to operate in normal lighting conditions and optimized to operate in low and zero light conditions.The webcam night vision feature includes two Infrared (IR) lights located on each side of the webcam and behind the display panel bezel. Low to zero light conditions will cause the webcam IR lights to activate. The IR lights provide illumination for low and zero light conditions and help prevent fuzzy images that are typically associated with operating standard webcams in low and zero light conditions. Turn off the webcam IR lights. While some degree of purple tint may be present under low light conditions, turning off the webcam IR lights will reduce and in certain cases eliminate the purple tint.
Select Start > All Programs > HP > HP MediaSmart > HP MediaSmart Webcam .
In HP MediaSmart Webcam, select Settings > Display > Advanced Settings , and then click the Camera Control tab.
Select the Low Light Compensation check box, and then click Apply .
Click OK .
NOTE:Disabling the webcam IR lights will cause display images to appear darker in low and zero light conditions. The webcam IR lights are also available on other webcam programs. Refer to the software Help for additional information. This document will be updated if additional information becomes available.
Your Cam does not have the ability to deal with low lite hence the black screen. This happens alot with webcams from the Lower end of the market. Webcam like the logitec ons have an option to deal with low light situations.
Try pressing the "Fn" and "esc" buttons on the keyboard both at the same time to turn the camera on or off. It may work or may not, but that is the way it is supposed to work. There have been a lot of problems with this web cam and yahoo messenger. The only other thing I can suggest is to contact Lenovo and see if they might have another driver that can resolve this.
Here the time comes to break the problem of Zebronics 151 wc drivers
you can download the uploaded file of the cd in the below link and just
unRAR it and just install ait demo driver in it by unplugging camera from pc and then plug the webcam into it and then Click continue installation then finish the installation
That's it your problem got fixed
The link is