Hello Steven / List > Computer screen or TV screen? There's a big difference.
Well I do it on computer screen, but now I know what I'll get. If it looks Ok on a computer screen it will be far too dark on a TV. > What does the final MPEG-2 burned to a DVD look like on a TV set? Usually too dark if not using the gamma @ 1 on the camera. > I guess the next question I have is "how are you reducing to the PAL > standard"? Perhaps there's something about how that is being done > that is causing the range to be shifted to the dark side. find files | y4m422 | y4munsharp | y4mscaler -S option=cubic | yuvdenoise | yuvcorrect | mpeg2enc > Or are you going thru a YUV -> RGB -> YUV conversion step along the > way - that would account for some of the level shift. Ho no ... long gone ... thanks to y4m422 > Have you tried both settings? I wonder if the 0 means "none"/"disabled" > while 1 enables the gamma of whatever value is wired into the camera This is it the 1 enables the gamma correction wired to the camera. Results on TV are pretty god after but there is definitely a lost in the definition / sharpness, it tends to flatten a lot out... > -Y Y_0.95_16_235_24_235 > might be what you want. I've found, in my recent conversions of > old/dark tapes, that a gamma adjust of 0.95 works nicely to brighten > the data without overexposing/blowing-out the highlights. Ok will give it a go .... I think I can get rid of -Y CONFORM then.. > Problem with the current state of the tools is that there's no > immediate visual feedback. Well I choose a short scene and yuvplay, but then, yes, I need to go back to the script, modify etc .... I tried to install Cinepaint without much success... > You need to run an encoding session, > look at the results, change the script(s), repeat. I use FinalCutPro > to do all my editing and color correction - there you can adjust the > filters and see (on an external TV monitor) the effect. ->> Well What I can do is actually foward the acquisition to my TV card (eventually a use for it !!!!!) then a TV monitor, broadcast ones are too expensive yet for me.. > First lesson is to use a TV monitor and not a computer screen for > video editing (color correction). I will then use DV files and Kino option External monitor.. Get my parameters Ok, then go back to raw data directly to mpeg2enc.... > What does 'y4mhist' say about your data? Run a few frames thru > 'y4mhist' (which understands 4:2:2 so there's no need to convert > the chroma sampling). The Y' table will show the distribution of > luma samples (a waveform monitor would be Nice - but that's probably > outside your budget ;)). If there's a heavy concentration below 32 Ok will keep that in mind.... > or > so then the scene is quite dark. Run a histogram before and after > whatever processing is being done to reduce to PAL and see if the > levels are being shifted. Good point .... Should have done that already; the first step in fact... Will keep you posted. > Good Luck! Thanks a lot E ------------------------------------------------------- SF.Net email is Sponsored by the Better Software Conference & EXPO September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf _______________________________________________ Mjpeg-users mailing list Mjpeg-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mjpeg-users
