ISO/TS 23564:2020 PDF

Overview

ISO/TS 23564:2020 specifies procedures for evaluating the colourimetric accuracy of ICC v4 profiles (as defined in ISO 15076-1). The technical specification focuses on objective tests for colour transform accuracy of colorimetric rendering intents (media-relative / ICC-Absolute), describing how to quantify forward and inverse model performance in ICC profiles. It does not cover subjective tests (perceptual or saturation rendering intents) or high dynamic range (HDR) colour media/spaces.

Key topics and requirements

• Profile evaluation tests: Two main test classes:
  • Round trip tests - verify inversion accuracy when converting PCS → device encoding → PCS using BToA1Tag and AToB1Tag.
  • Device model tests - assess forward/inverse model accuracy for predicting device colourimetry from encoding values (and vice versa).
• Tags and models:
  • Forward model encoded in AToB1Tag; inverse in BToA1Tag.
  • Use chromaticAdaptationTag to convert between measurement illuminants and PCS (D50) when required.
• Test data and metrics:
  • Use test images (e.g., ISO 12642-2) and additional application-specific colour subsets (neutrals, skin tones).
  • Report colour differences as median, maximum and 95th percentile ΔE00, with PCSLAB scaled to ICC‑Absolute colourimetry.
  • Typical round-trip results: **median ΔE00