user19836: How could I replace the background of a video such as the one in the picture

to a bright white? I have iMovie, is it of any use here?

user19791: That's a tricky one since the background color is the same as the shirt shes wearing. This can be achieved Manually by masking your subject frame by frame, if there is no much movement and duration is little then this shouldn't be a problem, although you might have some difficulty with the hair.
Note: masking should not be very accurate in this case, make a fast one then feather it and increase the brightness of the layer behind "background" until it becomes bright white and see if you like the result.

19836: <p>How could I replace the background of a video such as the one in the picture
<a href="https://i.stack.imgur.com/3TBDN.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3TBDN.png" alt="enter image description here"></a>
to a bright white? I have iMovie, is it of any use here?</p>
 19791: <p>That's a tricky one since the background color is the same as the shirt shes wearing.<br> This can be achieved Manually by masking your subject frame by frame, if there is no much movement and duration is little then this shouldn't be a problem, although you might have some difficulty with the hair.<br>
<strong>Note:</strong> masking should not be very accurate in this case, make a fast one then feather it and increase the brightness of the layer behind "background" until it becomes bright white and see if you like the result.</p>
