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View Full Version : [photography] Best way to key/alpha photos taken in green/blue screen in GIMP?



OrangeVixen
July 30th, 2011, 07:49 AM
What is the best way to key photos taken in a green screen or blue screen (key green or key blue) in GIMP?

I'm aware of the "Select by Color" tool, but I need a plugin or some one-pass tool/filter that I can use that will:

Alpha the background
Reduce spill/throwback green or blue
Adjust "noise" and transparency from spill/throwback

Something similar to Final Cut Pro's Motion 4 Primatte RT filter.

earlycj5
July 31st, 2011, 12:12 PM
Colors > Color to Alpha?

jasonrisenburg
August 2nd, 2011, 04:47 AM
http://www.nebomusic.net/chromakey.html

jasonrisenburg
August 2nd, 2011, 04:48 AM
I wish there was like buttons in here.

prokoudine
August 2nd, 2011, 04:20 PM
Did you try Foreground selection (http://docs.gimp.org/en/gimp-tool-foreground-select.html) tool? In my experience it works very well on more or less solid backgrounds.

There is a GEGL operation for matting, but it doesn't have a nice UI yet, so I wouldn't recommend it to a GIMP newbie, especially when you need to process pictures with alacrity :)