user2575: I would like to know if anyone out there knows of any free software, or software not as expensive as Adobe After Effects, that can do Difference Matte Keying? I have searched the web a little and have not come up with any promising results. Note: Chroma Keying is not an option. I am on a Windows 7 computer.
Thank you in advance for your time, and possible help.

user1038: Seems like Cinelerra can. Haven't checked how well it works though, I've been wanting to install it for quite some time but never got around to doing it yet.

user1147: Blender, which is free and open-source, can do difference matte keying.
I don't know if it's better or worse than After Effects' keyer because I haven't used it before.


2575: <p>I would like to know if anyone out there knows of any free software, or software not as expensive as Adobe After Effects, that can do <a href="http://help.adobe.com/en_US/aftereffects/cs/using/WS3878526689cb91655866c1103a9d3c597-7b52a.html#WS3878526689cb91655866c1103a9d3c597-7b4ba" rel="nofollow">Difference Matte Keying</a>? I have searched the web a little and have not come up with any promising results. <strong>Note: Chroma Keying is not an option. I am on a Windows 7 computer.</strong></p>

<p>Thank you in advance for your time, and possible help.</p>
 1038: <p>Seems like <a href="http://cinelerra.org/docs/split_manual_en/cinelerra_cv_manual_en_14.html#Difference-key" rel="nofollow">Cinelerra can</a>. Haven't checked how well it works though, I've been wanting to install it for quite some time but never got around to doing it yet.</p>
 1147: <p><a href="http://blender.org" rel="nofollow noreferrer">Blender</a>, which is <strong>free and open-source</strong>, can do difference matte keying.</p>

<p>I don't know if it's better or worse than After Effects' keyer because I haven't used it before.</p>

<p><img src="https://i.stack.imgur.com/FDTv8.png" alt="Difference matte keying with Blender&#39;s node-based compositor."></p>
