Thanks, that technically answers my question.
But, it still doesn't change the result.
If I only convert the clip, the color looks correct. But as soon as I resize it (second filter) it goes all mint colored instead of the whitish green it should be.
I have tried over and over again to make a screenshot or video of the two clips, but the resized one goes transparent. Saving a screenshot in VLC makes the clips look identical (which I would want, if it happened in video).
I guess I could get a camera and record the screen; that can't fail.