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GB/T 12823.4-2008Photography and graphic technology - Density measurements - Part 4: Geometric conditions for reflection density (English PDF)

摄影密度测量第4部分：反射密度的几何条件

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Issued by

State Administration for Market Regulation, Standardization Administration of China

Level / Type

National · Recommended

Issue date

July 2, 2026

Implementation date

February 1, 2027

Scope

GB/T 12823.4-2008 is the English-translated version of 摄影密度测量第4部分：反射密度的几何条件.

GB/T 12823.4-2008 is the Chinese standard "Photography and graphic technology - Density measurements - Part 4: Geometric conditions for reflection density". It was issued by State Administration for Market Regulation, Standardization Administration of China. Issued on 2026-07-02, in force from 2027-02-01.

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Document preview — GB/T 12823.4-2008

National Standard of the People's Republic of China

ICS: 37.040.01
Classification: G80

Issued by: State Administration for Market Regulation, Standardization Administration of China

Foreword
About this standard
Related standards
Classification and status

1 Foreword

GB/T 12823.4-2008 was issued by State Administration for Market Regulation, Standardization Administration of China on 2 July 2026 and has been in force since 1 February 2027.

It is one of 6 parts of the GB/T 12823 series.

2 About this standard

Sector: National Standard (Recommended)

Issued by: State Administration for Market Regulation, Standardization Administration of China

English translation: about 13 pages (approximate)

Chinese original: about 20,236 characters

3 Related standards

Other parts of this standard:

GB/T 12823-1991 — Part 1: Geometry and functional notation

GB/T 12823.1-2008 — Part 1: Geometry and functional notation

GB/T 12823.1-2026 — Part 1: Geometry and functional notation

GB/T 12823.2-2026 — Part 2: Geometric conditions for transmittance density

GB/T 12823.3-2025 — Part 3: Spectral conditions

Other editions:

GB/T 12823.4-2026 (later edition)

4 Classification and status

International classification (ICS): 37.040.01

Chinese Standard Classification (CCS): G80

Prefix GB/T: recommended standard.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 13 pages — is available in the English PDF.

Referenced standards

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