I have a video of a guy walking that I want to loop and paste over other video to make it look like he's walking through that area. I know, I should've used a green screen, but alas I didn't and am now trying to "fix it in post."
I've imported the loop into photoshop frame by frame, and have been magneto-lassoing his body and then selecting inverse, and hitting delete. When I do this, it shows the checked "transparency" in photoshop, surrounding the guy. Perfect! However, when I export the video, the background is now BLACK, NOT TRANSPARENT. How can I get it to just render NEGATIVE SPACE, like literally nothing just see-thru. Is this possible?
I have the guy in the middle of the frame, and I only want him, NOT the background...but I need those dimensions to preserve him in the right part of the screen, and that's why I want a real transparent background.
I am firstly interested in photoshop solutions to this problem, but will also welcome AE/Premiere results as well.
I think you will find it may not be possible to do with the newer versions of Photoshop with the new video timeline for they only contain a stripped down Adobe Media Encoder with a few canned preset. I do not do Video and can not answer if the older versions of Photoshop that did not use Adobe media encoder can. Some of the old supported formats like AVI, Apple Mov may have support for video with Alpha channels. A quick Google search seems to show that Premier Pro which has the full version of Adobe Media Encoder has some Video Alpha Channel support exporting video with an alpha channel (transparency) | Premiere Pro work area
I tried, but ended up just cutting each farm individually and then exporting to .PNG files, which preserve the actual transparency, then importing those into an image sequence.