Epson EMP-1715/1710 - Manual (Page 25)

Adjusting Colour for Several Projectors (Multi-Screen Colour Adjustment) 25
D
Adjusting "Color Correct. (G/R)" and "Color Correct.
(B/Y)".
Each time the [Enter] button is pressed the image displayed
changes between the pattern display and the actual image, and you
can check the adjustment results and make corrections in the actual
image.
E
Repeat procedures 2 to 4 until adjustments are
finished.
F
When all adjustments are finished, press the [Menu]
button to close the configuration menu.