BlurredBlueCorrelation 1058 butteraugli.cc   ImageF blurred_b_y_correlation0 = BlurredBlueCorrelation(pi0_.uhf, pi0_.hf);
BlurredBlueCorrelation 1059 butteraugli.cc   ImageF blurred_b_y_correlation1 = BlurredBlueCorrelation(pi1.uhf, pi1.hf);