Overview
ISO 14807:2001 - "Photography - Transmission and reflection densitometers - Method for determining performance" defines a common set of reporting parameters and prescribes methods to determine and present densitometer performance. It applies to both transmission and reflection densitometers typically used in photography, graphic arts and radiography. The standard standardizes how manufacturers and users evaluate and report three core performance characteristics: ISO repeatability, ISO stability and ISO bias estimate.
Key topics and requirements
- Scope and applicability: Targets densitometers used in photographic, graphic arts and radiographic trades and establishes uniform reporting parameters.
- Performance characteristics:
- ISO repeatability - closeness of agreement under repeatability conditions (same procedure, instrument, operator, environment, short time).
- ISO stability - ability of an instrument to maintain metrological characteristics over time (standard includes both 8-hour and 7-day stability determinations).
- ISO bias estimate - estimate of systematic error (bias) of the instrument; the standard notes limitations in averaging bias across models.
- Sampling and handling: Instruments evaluated must be stored, handled and operated per manufacturer instructions; deviations must be documented. Manufacturers should use statistically valid sampling when deriving typical performance specifications.
- Measurement and reporting methods: Detailed procedures for repeatability, stability and bias determination and standardized reporting formats for:
- individual instrument performance (repeatability, stability, bias)
- manufacturer-reported performance specifications (average/typical repeatability and stability)
- Traceability and metrology terms: Uses internationally-accepted metrology definitions (VIM), and emphasizes calibration, reference/certified reference materials and uncertainty concepts.
Practical applications
- Enables objective comparison of densitometers across manufacturers by standardizing test methods and reporting.
- Helps manufacturers produce defensible performance specifications for product datasheets (typical repeatability and stability).
- Assists calibration laboratories and quality managers in verifying instrument performance and establishing traceability.
- Useful for photographic labs, prepress/graphic arts facilities and radiography departments that require reliable density measurements for process control, QC and archival imaging.
Who should use this standard
- Densitometer manufacturers
- Calibration and testing laboratories
- Quality assurance personnel in photography, printing and radiographic services
- Procurement teams comparing instrument specifications
Related standards
Normative references in ISO 14807 include:
Keywords: ISO 14807, densitometer performance, transmission densitometer, reflection densitometer, repeatability, stability, bias estimate, photographic metrology, calibration, traceability.
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