Table 1.

Qualitative analysis for gray level selection

RGB color selection	ATDR	AFPR	AEP
Simple gray conversion	73.0731	3.013	8.7125
R value from RGB scale	52.793	0.5045	13.576
G value from RGB scale	78.772	3.3987	7.8718
B value from RGB scale	94.74	3.8341	5.6915
L value from L*a*b scale	69.7847	2.8542	9.47
a value from L*a*b scale	21.9443	53.4237	62.0178
b value from L*a*b scale	36.4974	53.7768	60.7508