Imerge: Keying. Same effect. Hitfilm good, Imerge (linear color) bad result.
Sample masking test file.
Use Remove Stock background. Luminance key has same issues.
Put a suitable solid color in the background. Pink maybe!
Remove stock background or Luminance. Hitfilm can give a reasonable result when not linear.
Imerge. Always harsh halos on the hair. Following up with the Remove color matting effect helps but it is still not worth attempting to key something like this.
When Linear Hitfilm still does better than Imerge.
It seems a linear color model craps this out(?) Is there any way to work through this?