Hi Kim, On Thursday 03 March 2011 16:01:24 Kim HeungJun wrote: > Hello everyone, > > I have a question about realization the camera brightness control (or > exposure, because it's similar effect). I'm confused this similar two > control - V4L2_CID_BRIGHTNESS and V4L2_CID_EXPOSURE. > > These control both express the brightness consequently. > > The CID can express the brightness - V4L2_CID_EXPOSURE, is prepared in the > camera class. And V4L2_CID_BRIGHTNESS seems be possible to use in the > camera driver, although it is defined in the global(?) class. > > So, which CID I can use to express the image's brightness?? V4L2_CID_EXPOSURE is used to control the exposure time (which obviously influences the brightness), and V4L2_CID_BRIGHTNESS to control the brightness offset (constant value added to all pixels in the image by a processing block in the digital domain). -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
