• 2025
• ICC Expert Day on Individual Colour Matching
• Hong Kong HDR Colour Symposium

---

• 2024
• Spectral Imaging Experts' Day, Gjøvik

---

• 2023
• London Meeting Invited Speaker session

---

• 2022
• HDR Experts' Day

---

• 2020
• ICC DevCon 2020
• Munich, 10-11 February

---

• 2019
• ICC Color Experts' Day, Bressanone

---

• 2018
• ICC Color Symposium Hong Kong, 22 October
• Grand Rapids, MI, 30-31 May
• ICC DevCon 2018
• Munich, 25-26 February

---

• 2017
• Ryerson Toronto Graphic Arts Day, 13 October
• Toronto, 11-12 October
• Prague Graphic Arts Experts' Day, 29 June
• Prague, 27-28 June
• Tokyo, 19-20 April

---

• New HDR metadata tags registered

• ICC.1 Amendment: Adaptive Gain Curve

• Scholarship fund

• ICC Research Portal

• IP policy

• Colorimetry data

• Profile security

• ICC tech note on embedding an iccMAX profile in a v4 profile

• iccMAX Demo Implementation - v2.1.3 released

• New version of ICC.2 (iccMAX) published

• Dr Danny Rich

• New version of ICC.1 (v4.4) published

• Tech note on partial adaptation

• Interoperability Conformance Specifications approved

• ICC DevCon2020 - recordings available!

• ICC working group on HDR

• Android lock screen bug

• iccMAX published as ISO 20677

• iccMAX

• ICC White Paper on iccMAX Calc programming

• ICC video

• Display calibration

• PRMG-based exchange profile for digital print

• Profiling tools

• ICC Profile Registry

• sRGB profiles

• Why join ICC?

• What is an ICC Profile?

• Using CxF for printing spot inks

• What is FOGRA39?

• Consistent colour appearance

• Colour management resources in Chinese

• Colour gamut analysis

• iccMAX: a new colour management paradigm (video)

dictType metadata entry: Content Light Level

Owner: Apple Inc

Contact: Nicolas Bonnier ([email protected]), Luke Wallis ([email protected])

Change date: 04-06-2025

Category: HDR Image

Name: CLL

Meaning of name: CLL describes light level of the image content.

Usage restriction: Optional

Display name element: Content Light Level

Value	Meaning	Display element
Floating point number, floating point number, 8-bit number	Floating point numbers describe light level characteristics (maximum and average) of the image content. Value of 0.0 means that the respective value is unknown. 8-bit number defines color primaries as per ITU-T H.273. Primaries value of 0 means that primaries cannot be expressed by ITU-T H.273 and they are defined by tags required by three component matrix-based display profile containing this metadata.	Content Light Level