Table 3. Values of RGB and CIE L^*, a^*, b^* color spaces for sample’s images under different preservation modes, and their respective total color difference ΔE

Preservation modes		Day of observation	RGB color space			CIE L^, a^, b^* color space			ΔE
Preservation modes		Day of observation	R	G	B	L	a^*	b^*	ΔE
1	UV-C irradiated + refrigerated	0th day^*	196	203	194	80.929	−4.043	3.642	2.323
1	UV-C irradiated + refrigerated	3rd day	202	203	195	81.406	−1.780	3.855	2.323
2	UV-C irradiated + stored in room temperature	0th day^*	189	193	186	77.581	−2.669	3.027	11.604
2	UV-C irradiated + stored in room temperature	3rd day	177	165	152	68.405	2.100	8.290	11.604
3	Refrigerated only	0th day^*	214	221	213	87.394	−3.801	3.091	31.054
3	Refrigerated only	7th day	183	158	117	66.371	3.220	24.842	31.054
4	Control (unirradiated + stored in room temperature	0th day^*	206	218	206	85.867	−6.230	4.499	42.502
4	Control (unirradiated + stored in room temperature	3rd day	128	106	85	46.383	5.426	15.064	42.502

0th day is the day when oyster mushroom samples were UV-C irradiated.