ISO 18909:2022
Photography — Processed photographic colour films and paper prints — Methods for measuring image stability
Photography — Processed photographic colour films and paper prints — Methods for measuring image stability
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 58
- Дата публикации:
- 15 февраля 2022 г.
- Издание:
- ISO IS 18909 edition 2 version 1
- ICS:
- 37.040.20
This document describes test methods for determining the long-term dark storage stability of colour photographic images and the colour stability of such images when subjected to certain illuminants at specified temperatures and relative humidities. This document is applicable to colour photographic images made with traditional, continuous-tone photographic materials with images formed with dyes. These images are generated with chromogenic, silver dye-bleach, dye transfer, and dye-diffusion-transfer instant systems. The tests have not been verified for evaluating the stability of colour images produced with dry- and liquid-toner electrophotography, thermal dye transfer (sometimes called dye sublimation), ink jet, pigment-gelatin systems, offset lithography, gravure and related colour imaging systems. If these reflection print materials, including silver halide (chromogenic), are digitally printed, refer to ISO 18936, ISO 18941, ISO 18946, and ISO 18949 for dark stability tests, and the ISO 18937 series for light stability tests. This document does not include test procedures for the physical stability of images, supports or binder materials. However, it is recognized that in some instances, physical degradation such as support embrittlement, emulsion cracking or delamination of an image layer from its support, rather than image stability, will determine the useful life of a colour film or print material.
Abstract
Overview
ISO 18909:2022 - "Photography - Processed photographic colour films and paper prints - Methods for measuring image stability" - defines standardized test methods to evaluate the long-term dark storage stability and light (display) stability of colour photographic images formed with dyes. It applies to traditional continuous‑tone photographic materials (chromogenic, silver dye‑bleach, dye transfer, dye‑diffusion‑transfer instant systems) and describes accelerated ageing and light‑exposure procedures used to predict real-world performance.
Key topics and technical requirements
- Scope and exclusions
- Covers dye‑based, continuous‑tone colour films and prints.
- Not verified for electrophotography (dry/liquid toner), thermal dye transfer (dye‑sublimation), inkjet, pigment‑gelatin systems, offset/gravure printing.
- For digitally printed reflection materials, refers to related ISO standards (see Related Standards).
- Dark‑stability test methods
- Accelerated high‑temperature ageing with controlled relative humidity to model long‑term dark storage behaviour.
- Specimen handling options: free‑hanging in air or sealed in moisture‑proof bags; conditioning and incubation procedures are specified.
- Data treatment and computation of image‑life parameters (including Arrhenius‑based approaches in informative annexes).
- Light‑stability (display) test methods
- Controlled irradiation tests with specified illuminants, temperatures and relative humidity.
- Illuminant prescriptions include xenon arc for simulated indoor/outdoor daylight (e.g., 50–100 klx), glass‑filtered fluorescent (Cool White, ≤80 klx), incandescent (CIE illuminant A, ~3.0 klx), simulated outdoor sunlight (D65 at 100 klx), and high‑intensity slide projection (1 000 klx).
- Requirements for irradiance measurement, specimen backing, and normalization of test results.
- Measurement and analysis
- Sensitometric exposure, processing, densitometry, density correction methods and color‑balance assessment.
- Annexes provide interpolation methods, density corrections, data treatment and worked examples.
Practical applications and users
ISO 18909:2022 is essential for:
- Conservation professionals and archives - to assess and plan long‑term storage and display strategies for colour photographs.
- Photographic material manufacturers and processors - for product development, quality control and specification of expected image life.
- Testing laboratories - to run reproducible accelerated ageing and light‑exposure tests and report standardized metrics.
- Museums, galleries and libraries - to evaluate risks from exhibition lighting, glazing, humidity and temperature and to set conservation policies.
- Photographers and repro labs - to understand fading risks and make informed choices about materials and display conditions.
Keywords: ISO 18909:2022, image stability, photographic colour films, paper prints, dark stability, light stability, accelerated ageing, dye fading, colour balance, conservation.
Related Standards
Технические детали
- Технический комитет
- ISO/TC 42 - Photography
- SKU
- ISO 18909:2022
Похожие стандарты
Стандарты, упомянутые в описании