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View Full Version : Correcting cine film colour bias

RippingPete
21st January 2006, 23:11
I have some old 8mm cine film that has already been transferred to DVD by a commercial company. They did a very good job, but the original film's colour balance had degraded over time (30 years :eek:) .

I know I can use the RGBAdjust filter in AVISynth to adjust RGB balance, but finding out what adjustments I need takes a lot of time and experimentation. If I was adjusting still photos in Photoshop I could use "auto levels" to optimise the RGB balance automatically (yes, I'm a nebie to video editing).

Is there an equivalent filter/program available for AVISynth?

Many thanks
Backwoods
21st January 2006, 23:35
ColorYUV(autowhite=true)
krieger2005
22nd January 2006, 00:33
Maybe this (http://forum.doom9.org/showthread.php?t=93571) could be intresting for you
RippingPete
23rd January 2006, 15:40
Hi guys,

Thanks both for the useful responses. Very helpful.

I've now tried ColorYUV, which I was using but had not spooted the autowhite=true, or the autogain=true, which work very well.

HDR AGC looks very promising, with more features, but was a bit slow (it did say that in the readme, to be fair).

Thanks again,
communist
23rd January 2006, 16:13
HDR AGC looks very promising, with more features, but was a bit slow (it did say that in the readme, to be fair).

You can try setting mode=1 which is faster but may produce artifacts (halos). Default is the slower mode=2 which gives better image quality.

There are several plugins to adjust colors - have a look at Channel Mixer, ColorLooks, TweakColor, ExpSat.
http://forum.doom9.org/showthread.php?t=97706
Others are available at http://www.avisynth.org/warpenterprises/
Backwoods
23rd January 2006, 19:55
There are several plugins to adjust colors - have a look at Channel Mixer, ColorLooks, TweakColor, ExpSat.
http://forum.doom9.org/showthread.php?t=97706
Others are available at http://www.avisynth.org/warpenterprises/

I think Channel Mixer only works in black and white, unless another version came out for color.
Mug Funky
24th January 2006, 09:01
if you get mergergb, you'll be able to make several grey channelmixed clips and merge them as new R, G, and B channels.