changes to chroma key algorithm

	new file:   obj/linux64/Release/src/main.d
	new file:   obj/linux64/Release/src/main.o
	new file:   obj/linux64/Release/src/ofApp.d
	new file:   obj/linux64/Release/src/ofApp.o
	new file:   obj/linux64/Release/src/ofxChromaKey.d
	new file:   obj/linux64/Release/src/ofxChromaKey.o
	modified:   src/ofApp.cpp
	modified:   src/ofxChromaKey.cpp
	modified:   src/ofxChromaKey.h