Analysis of discrimination threshold on the tritan axis.
Discrimination thresholds on the tritan axis were obtained for an extensive group of 66 stimuli: in some of the stimuli, S-cone trolands were held constant by keeping the product of the S-cone excitation level and the luminance unchanged, while in others only the luminance was changed to establish various S-cone troland values. These thresholds depended clearly on the S-cone value of the stimuli, while they remained almost constant against the retinal illumination. Thus, we noted that the excitation of the L - 2M channel had practically no influence over the discrimination threshold on the tritan axis, although this independence of delta S from L - 2M was not so obvious when the S value was high. With our data, we performed different fits, and found that the fit including the terms S, (L - 2M) and (L + M) adapted better to our results.
García
J A
JA
Departamento de Optica, Facultad de Ciencias, Universidad de Granada, Avda. Fuentenueva, s/n. 18071 Granada, Spain. jgarcia@goliat.ugr.es
Yebra
A
A
Hita
E
E
Romero
J
J
D000328:Adult; D003118:Color Perception / Q000502:physiology*; D004056:Differential Threshold / Q000502:physiology*; D005260:Female; D006801:Humans; D008029:Lighting; D008297:Male; D017949:Retinal Cone Photoreceptor Cells / Q000502:physiology*