Yeah, I thought of using a eyedropper tool, but I'm not sure how I'm going to ultimately determine which colors are "closer" in an objective sense.
Say the true color is Red 150, Green 77, Blue 204. Sealant 1 changes colors to Red 145, Green 79, Blue 207. Sealant 2 changes the colors to Red 153, Green 74, Blue 202. How exactly am I going to say which one is better? I guess I could see how much each color changed for red, green and blue and add that together. So sealant 1 in my example is 5+2+3=10. Sealant 2 is 3+3+2=8. Sealant 2 wins. Maybe that works? Was just hoping some program could give me something similar to the percent convergence values given for monitor tests.