On Sun, 2004-04-25 at 10:59, [EMAIL PROTECTED] wrote: > Hi, > > I'm a complete novice to video processing. I just bought a LML33. > I have the latest zoran driver. > I capture using "lavrec -fa -in -d2 -q100 -Rl -l100". > The recording is very good except that any bright white is too bright. > The picture is washed out. > Otherwise the picture is good. > I test playback with "lav2yuv test.avi | yuvplay". > I've played with yuvcorrect_tune but it's pretty much Greek. > How can I rebuce the brightness of very white scenes.
You can reduce luminance/contrast with yuvcorrect like so: lav2yuv test.avi | yuvcorrect -Y Y_1.0_0_255_0_235 | yuvplay This maps the input brightness (luminance) range 0-255 to the output range 0-235. 235 is "white", so this will bring anything greater into the visible range. However, if your input was greater than 255 it was already clipped and the above will not help (nothing will). The purists out there might prefer yuvcorrect -Y Y_1.0_16_255_16_235 which preserves "black" at value 16. Or, if your problem is that the NTSC setup is not being removed (my camcorder has this feature), try this: yuvcorrect -Y Y_1.0_16_255_0_239 which just shifts the whole image down by 16 luminance values. Dan Scholnik ------------------------------------------------------- This SF.net email is sponsored by: The Robotic Monkeys at ThinkGeek For a limited time only, get FREE Ground shipping on all orders of $35 or more. Hurry up and shop folks, this offer expires April 30th! http://www.thinkgeek.com/freeshipping/?cpg=12297 _______________________________________________ Mjpeg-users mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/mjpeg-users
