Avisynth: How to Reduce Redness?

muhali3 · #1 10-22-2003, 04:31 PM

my question is how can i reduce the redness level in my source by using avisynth and not by TMPGenc

i don't know what i should use, tweak, limiter, or what?

Thanks

Dialhot · #2 10-23-2003, 03:36 AM

Limiter has nothing to do with colors.
Tweak is for that.

There is a wonderfull thing that comes with Avisynth that is called THE MANUAL. You should read it once.

kwag · #3 10-23-2003, 07:31 AM

...which is around here http://www.avisynth.org/index.php?page=Tweak

-kwag

Dialhot · #4 10-23-2003, 07:37 AM

I' rather the version that is locally on my (and surely your) PC : in the "docs" directory of avisynth !

kwag · #5 10-23-2003, 08:11 AM

Quote:

Originally Posted by Dialhot

I' rather the version that is locally on my (and surely your) PC : in the "docs" directory of avisynth !

But isn't the one on the site more "up to date"

It's a "WiKi" site, so it's updated on-line

-kwag

Dialhot · #6 10-23-2003, 08:53 AM

Quote:

Originally Posted by kwag

But isn't the one on the site more "up to date"

It's a "WiKi" site, so it's updated on-line

Yes it is. But what is the interest to have a documentation talking about something you perhaps don't have on your PC because your avisynth version is rather old ?
It's like seeing tweaking hints for winXP on the net and being unable to use them at home because you have win2000.

sh0dan · #7 10-23-2003, 11:36 AM

If you only want to remove reddish colors, try:

coloryuv(cont_v=-64)

Values closer to 0 will pass more red, closer to -256 will completely remove all red.

muhali3 · #8 10-23-2003, 11:48 AM

thanks shodan, its working just like i wanted it to.

jorel · #9 10-23-2003, 11:55 AM

Quote:

Originally Posted by sh0dan

If you only want to remove reddish colors, try:

coloryuv(cont_v=-64)

Values closer to 0 will pass more red, closer to -256 will completely remove all red.

great Sh0dan!

means that if i use:
coloryuv(cont_u=-64)
i can reduce the blue?

if is right,how can i reduce the green?

sh0dan · #10 10-24-2003, 03:37 AM

@jorel: Yes - reducing v will reduce blueish tones.

Green is a bit more tricky, but this helps:

Code:

v = coloryuv(off_u=-128, off_v=-128)
v = coloryuv(v,off_u=128, off_v=128)
mergechroma(last, v, 0.6)

Adjust the mergechroma factor to adjust how much green should be removed. The same method can be used for other colors, by changing the numbers.

jorel · #11 10-24-2003, 07:25 AM

thanks,
i got the "idea" !

ps:
avisynth remember me the way
that "color channel" work in tvs.
sometimes is seamless!