Thanks but none none of these setting help. How can I tell what the input was recorded at, if it was greater that 255? Would this be a setting for the zoran driver or lavrec? I don't know enough yet to determine where the problem is?
Richard Ray On Sun, 25 Apr 2004, Dan Scholnik wrote: > 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 > ------------------------------------------------------- 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
