Color Correction Rendering Problem
by Thomas DIckens
on
Jul 11, 2008 at 6:45:37 am
OK, this is a weird one. I should have posted before, but I thought I'd pull my hair out for 3 months instead.
I have a 1920X1080 feature (my first) that I am editing and readying for final render for the Festival in a week and 1/2.
There are several scenes in the movie that I have done color correction on and most work pretty well. What I color correct is what I get in final render.
But there is a sequence that I have done day for night. It was originally overcast day. I did various tricks in color correction and actually got it to look very real and just about where I want it in the Vegas Preview window. It has a bit of a blueish cast to it over all. I subtracted a lot of red/green/saturation in general and pumped up blue. It looks great. BUT when I render it (I have tried many settings) as DNxHD, this one area of the video looses nearly all the blue and it looks brown/green on the final output! My months of color correction are completely destroyed. It looks NOTHING like what it looks like in the preview window.
Now here is the really weird part! If I render short sections of the blue area it seems better. It seems to render some of the blue from the color correction. I get it to where it looks somewhat acceptable, but still nothing like in the window (no blue, but brown instead). BUT, the weird thing is that if I play it over and over in quicktime, it actually appears to get MORE BROWN and loose MORE BLUE as it is played! Is this a bug in the codec, or in quicktime maybe?
I am at wits end. I can do screen grabs possibly to show this effect, not sure how to post them.
Re: Color Correction Rendering Problem by Steve Rhoden on Jul 11, 2008 at 11:51:08 am
Just maybe you have more than one keyframe in the color correction
that you don't realize is there, that changes the colors overtime as
it plays.
First, check the color correction video fx windows to make sure you
have only one keyframe at the start and no other.
Hope you understand what i mean.
Steve Rhoden
Creative Director
TNX EFFECTS STUDIOS.
