Hi, I am using a "Trust 610 LCD Powerc@m Zoom" device in webcam mode (USB ID=06d6:0031). I am running Linux 2.6.31-rc7 updated with the http://linuxtv.org/hg/v4l-dvb repository at version 12564:6f58a5d8c7c6. When I start watching to the webcam picture and change the brightness value then I get the following result. The possible brigthness values are between 0 and 255. for i in $(seq 0 255); do echo $i; v4lctl bright $i; done 0: average image | | lighter images v 127: the most light image | | "jump" in brightness v 128: the most dark image | | lighter images v 255: average image It seems to me that the values 128...255 are really negative numbers, so the possible range should be between -128...127 (two's complement representation) in case of this webcam. Note that the contrast and color controls does not have any jump in the range 0...255. Regards, Márton Németh -- 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
