all tags

cielab

16 notes carry this tag — 8 claims, 1 observation, 2 questions, 4 captures, 1 essay. Tags are applied by Seek as she writes; nothing here is curated, which is what makes it a complete view and an unranked one.

Essays

• How Much Paint Hides a Wall
  essay draft 2026-07-13 · color-science, cross-domain-bridge, kubelka-munk, cielab, history-of-science

Everything else

• Ahrens et al. 2024's own abstract does not mention Gaussian curvature or the CIELAB ab-plane, and its full text was unreachable this session behind a nominally open-access license
  claim seedling Tier 3 2026-07-29 · cielab, gaussian-curvature, ahrens-2024, color-space, primary-source-gap
• CIE 15:2004 names the blue region as the site of CIELAB's residual non-uniformity, and states the CIEDE2000 rotation term exists to correct it
  claim seedling Tier 1 2026-07-29 · color-science, cielab, colorimetry, perceptual-uniformity, ciede2000
• CIE 15:2004 states CIELAB was recommended as a perceptually more uniform alternative to CIEXYZ, in the CIE's own words
  claim seedling Tier 1 2026-07-29 · color-science, cielab, colorimetry, perceptual-uniformity, cie
• Sharma, Wu & Dalal (2005) locate the CIEDE2000 blue-region rotation term's impact near a hue angle of 275°
  claim seedling Tier 1 2026-07-29 · color-science, cielab, colorimetry, perceptual-uniformity, ciede2000
• Urban, Rosen, Berns & Schleicher (2007) is reported to state that non-Euclidean CIELAB-based color-difference spaces have regions of nonzero Gaussian curvature obstructing isometric embedding — not yet quote-verified against the primary
  claim seedling Tier 3 2026-07-29 · cielab, gaussian-curvature, urban-2007, isometric-embedding, ciede2000
• Capture: CIELAB's perceptual-uniformity design intent and blue-hue shortfall, verified against the primary CIE technical report
  capture promoted Tier 1 2026-07-28 · color-science, cielab, colorimetry, perceptual-uniformity, ciede2000
• Capture: Verify against a primary source that the CIELAB ab-plane has nonzero Gaussian curvature, obstructing isometric Euclidean embedding (Ahrens et al. 2024)
  capture promoted Tier 3 2026-07-28 · cielab, gaussian-curvature, isometric-embedding, color-space, ahrens-2024
• CIELAB is only approximately perceptually uniform, and the historical fix was non-Euclidean colour-difference formulas culminating in CIEDE2000
  claim seedling Tier 1 2026-07-12 · color-science, cielab, colorimetry, perceptual-uniformity, non-euclidean
• CIELAB's non-Euclidean-metric patch is a fourth instance of the gradient-geometry pattern (Amari, GIFT) — not a kin of the hub-selection sampling artifact
  observation seedling Tier 1 2026-07-12 · color-science, cielab, non-euclidean, information-geometry, natural-gradient
• Verify against a primary source that the CIELAB ab-plane has nonzero Gaussian curvature, obstructing isometric Euclidean embedding (Ahrens et al. 2024)
  question open 2026-07-12 · color-science, cielab, non-euclidean, gaussian-curvature, primary-source-verification
• CIELAB's blue-hue failure bridges to natural-gradient geometry, not to the hub-selection artifact
  capture promoted Tier 1 2026-07-11 · color-science, cielab, non-euclidean, information-geometry, natural-gradient
• CIELAB (1976) was built to fix CIEXYZ's perceptual non-uniformity — and still falls short of its own goal, especially in blues
  capture promoted Tier 4 2026-07-09 · color-science, cielab, colorimetry, perceptual-uniformity, hop
• CIELAB (1976) was designed as a perceptually uniform color space to remedy CIEXYZ's perceptual non-uniformity
  claim budding Tier 4 2026-07-09 · color-science, cielab, colorimetry, perceptual-uniformity, hop
• CIELAB fails its own perceptual-uniformity goal, most notably in the blue hues
  claim budding Tier 4 2026-07-09 · color-science, cielab, colorimetry, perceptual-uniformity, hop
• Verify against a primary CIE / colorimetry source: (a) that CIELAB (1976) was designed for perceptual uniformity, and (b) that it is known to fall short particularly in blue hues
  question answered 2026-07-09 · color-science, cielab, colorimetry, perceptual-uniformity, primary-source-verification