A chroma scaling psychophysics experiment was conducted using a CRT in a dark surround. The experiment consisted of constant hue and lightness IPT step ramps on a uniform background. Each hue step ramp was displayed on an achromatic, a medium and a high chroma background. The results clearly show that chroma scaling is dependent on the chroma of the background. For the medium chroma backgrounds a modest crispening effect is evident. The results also show that chroma scaling on achromatic and high chroma backgrounds differ considerably. The data for the achromatic backgrounds are used to compare C~*, C and C_F chroma metrics. Additional comparisons using several of the phases of the LUTCHI data demonstrate that C and C_F are clearly better than C~* and that C has an intercept of roughly 0.1 for a linear fit between normalized scale and metric data. In comparison, C_F provides a good fit to the chroma scaling data and an intercept closer to 0.
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