CIELUVtiloissa

CIELUVtiloissa is a hypothetical color space derived from the CIE L*u*v* (CIELUV) color model. It is described in theoretical discussions as a nonlinear extension designed to improve perceptual uniformity for a subset of hues by applying a transformation called the tiloissa transform to the chroma plane while leaving L* unchanged. The name combines CIELUV with a coined term to reflect its tiling-like mapping of chromatic coordinates.

In this construction, a color is represented by (L*, T_U, T_V), where L* remains the same as in CIELUV, and (T_U, T_V) are obtained from the original (u*, v*) through a monotone, piecewise function. The tiloissa transform is intended to stretch mid-range chroma and compress extreme chroma regions to reduce perceptual differences under mixed lighting conditions, potentially mitigating certain metameric effects.

Properties attributed to CIELUVtiloissa include improved perceptual discrimination along targeted hue ranges while preserving the general advantages of a perceptually uniform color space. The transform can be parameterized by a stiffness or sharpness parameter that controls how aggressively the chroma coordinates are adjusted. Because it is not standardized, its behavior depends on the chosen tiloissa function and parameters.

Applications discussed in speculative contexts include color grading workflows in film and photography, perceptual color difference metrics for quality control, and metamerism analysis in display and illumination design. In practice, CIELUVtiloissa is treated as a theoretical or experimental construct rather than a widely adopted industry standard, and any conversions to and from established spaces would require careful calibration.

See also: CIE L*u*v* color space, perceptual color spaces, color difference metrics, metamerism.