Is there a way to adjust keyframes on the x or y planes after track motion is applied?

Question

I'm doing the image of a face thing tracked onto a video of a face.

I track the motion and apply x and y directions of the object ot the null object (and attach the face to the null object).

My problem is the face is going up and down too much (on the y plane). My trackers were tracked well on the face but I'd like to take the vertical movements down a rung.

Is there an expression that can do a y * 0.4 operation on the vertical movement of the face?

I suspect it is more complicated than this since the y values probably don't have a mean of zero.

I tried a few expressions like that in the null object where text goes in the 'Position' area but no luck. I'm quite new to this.

Mylenium · Answer

But then you have no reference point and your face could be anywhere in the shot... This won't work because the position data is absolute in comp space, not relative to your face. You need to at least add one track point for the overall face. Once you have that, you simply subtract the values and multiply the difference, then adding it back. Nothing to do with the expressions, a general flaw in your approach.

Mylenium

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