Is there any color control filter that can reduce saturation of red and yellow?

[lansing]

I'm trying to transfer my old recorded tape to the computer, one major problem is that the red and yellow color seem overexposed. I've tried colorYUV, but it just turned my picture to either green or blue when I tried to adjust them.

[IanB]

Possibly Tweak(sat=0.75, startHue=80, endHue=200)

Tweak's startHue and endHue values are unconventional and based on the angle in degrees of the UV vector expressed in polar coordinates.

Magenta 51
Red 108
Yellow 170
Green 231
Cyan 288
Blue 350

Also you might choose to only mute the highly saturated red and yellow by adding minSat=75.

Of course all values here are initial blind guesses, please fine tune them for optimal results.

[Mounir]

Have a look here (http://forum.doom9.org/showthread.php?t=162563)

[Ghitulescu]

Is this a problem of capturing or of the original recording?

[johnmeyer]

I assume that you are transferring from NTSC VHS tape. The colors on the red end of the spectrum often come out looking WAY too saturated because of the way color is embedded on NTSC VHS tape. NTSC red colors also tend to "bloom."

You may be able to use AVISynth to desaturate the reds and oranges, but I suggest that AVISynth is not the best tool for the job. Instead, see if your video editing program has something similar to the Secondary Color Corrector found in Sony Vegas. I use this all the time on VHS video captures for exactly the problem you describe. The reason I recommend using a tool like this is that you will find that you have to twiddle a lot of knobs to get exactly the color range (a single color won't work) and luma range (you don't want to reduce dark reds as much as bright reds) you want to reduce. You'll also want to feather the effect so that you don't get abrupt transitions as someone with a red shirt walks from sunlight to shade, or someone wearing a multi-colored shirt that includes various shades of red, walks in front of the camera.

Vegas is expensive, but Sony sells a "little brother" called Movie Studio. I just checked, and it includes this feature. Here is a short video (less than one minute) which shows how the feature works:

Secondary Color Corrector (http://dspcdn.sonymediasoftware.com/videos/moviestudio10/VMS_SecondaryColorCorrector.flv)

[Motenai Yoda]

assuming that yuv colorspace has 3 channel, and is very similar to the Lab color space in Photoshop:
Y channel = Luma
U channel = Yellow<128<Blue
V channel = Green<128<Red
with mt_lut u should be able to reduce only the low part in U-channel and high part in V-channel
(linearly, logarithmically, exponentially)

[Wilbert]

Try: http://forum.doom9.org/showthread.php?p=588033#post588033

[lansing]

I assume that you are transferring from NTSC VHS tape. The colors on the red end of the spectrum often come out looking WAY too saturated because of the way color is embedded on NTSC VHS tape. NTSC red colors also tend to "bloom."

You may be able to use AVISynth to desaturate the reds and oranges, but I suggest that AVISynth is not the best tool for the job. Instead, see if your video editing program has something similar to the Secondary Color Corrector found in Sony Vegas. I use this all the time on VHS video captures for exactly the problem you describe. The reason I recommend using a tool like this is that you will find that you have to twiddle a lot of knobs to get exactly the color range (a single color won't work) and luma range (you don't want to reduce dark reds as much as bright reds) you want to reduce. You'll also want to feather the effect so that you don't get abrupt transitions as someone with a red shirt walks from sunlight to shade, or someone wearing a multi-colored shirt that includes various shades of red, walks in front of the camera.

Vegas is expensive, but Sony sells a "little brother" called Movie Studio. I just checked, and it includes this feature. Here is a short video (less than one minute) which shows how the feature works:

Secondary Color Corrector (http://dspcdn.sonymediasoftware.com/videos/moviestudio10/VMS_SecondaryColorCorrector.flv)

apparently vegas movie studio has trial version, so i'm trying it out now, thanks for the advice

[wonkey_monkey]

It's very hard to say without a screenshot, but any chance this could help?

http://forum.doom9.org/showthread.php?t=151259

converttorgb32
selectivecolour(1,0,0, 0,0,-1, 0,0,0, 0,0,0, 0,0,0, 0,0,0, false)

That's the maximum for adjusting red and yellow - adjusting the 1 and -1 towards 0 will weaken the effect.

David

[johnmeyer]

apparently vegas movie studio has trial version, so i'm trying it out now, thanks for the adviceIf you need any help figuring out how to use Vegas/Movie Studio for this job, just ask here or contact me via PM.