Removing zoom of footage

Hi
I have footage that has a zoom in it. I would like to remove it so that the subject remains the same size. I have tracked the footage using mocha (scale) and have copied the track information into After Effects into the scale channel. Currently the tracking information further exaggerates the scale, how can I inverse it to remove the zoom.
Thanks Shawn

Hi Shawn,

You need to apply an expression to invert the scale channel in AE.

Select the scale channel and click Animation | Add Expression. In the expression box, type in the formula:

Code:

x = 10000/scale[0];
y = 10000/scale[1];
[ x, y ];

J-P

Hi Shawn,

I’m glad to hear that solved your problem. I’m no expert on AE expressions, so if you want to learn more you should read their Expression Reference, it’s at Help | Expression Reference in After Effects.

J-P

Hi J-P
Thanks that worked. You would not be able to explain the syntex
Thanks again for your help

will do thanks again
Shawn