The uniformity of two pairs of color spaces based on CIE 1997 color appearance model (CIECAM97s) is analyzed according to color-discrimination ellipses that are constructed using color-discrimination evaluation data. A new uniform color space named J_use a_ucs B_ucs is deduced by re-scaling the coordinates of lightness, redness-green- ness and yellowness-blueness in two initial color spaces using linear regression method. The uniformity of the new color space is obviously improved compared with the initial color spaces.
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