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How do I extract a color from part of an image and use in keying?

I want to pull out a rect from the corner, like 10x10 to 100x100 and feed it into the key color of the keying node. This is so I can auto detect if its a green screen or blue screen input.

enter image description here

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  • $\begingroup$ Just plug the crop output into the Key Color put of the keyer. $\endgroup$ – 3pointedit Dec 19 '16 at 5:35
  • $\begingroup$ @3pointedit I tried that, doesn't work $\endgroup$ – Petah Dec 19 '16 at 6:39
  • $\begingroup$ Perhaps you could add a "scale to scene" dimensions node after the crop? Shouldn't require this however. $\endgroup$ – 3pointedit Dec 23 '16 at 11:44
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You just needed to scale that to the image size

DOG

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