Hi,
I just ran across this forum so I thought that I’d post.
There are obviously many ways to do this in Photoshop. I’ve been doing Chroma Key Photohraphy for about 5 years now.
Because I was frustrated with the plug-ins on the market, I created a script that does a decent job for most images for extraction and spill suppression. It leaves the mask and layers editable. It works with CS3 and higher.
Sometimes the images may need cleaned up slightly but its really quick and gives a good starting point.
You can download it free at https://www.photoshopgreenscreen.com.
Damon Bell