GB/T 18117-2000
Photography-Processed photographic colour films and paper prints-Methods for measuring image stability (English Version)

Standard No.

GB/T 18117-2000

Language

Chinese, Available in English version

Release Date

2000

Published By

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China

Latest

GB/T 18117-2000

Scope

General requirements This standard specifies the test equipment, test procedures and analysis used to predict the long-term dark storage stability of color photographic images and to measure the color stability of such products after being irradiated by certain illuminants under specified temperature and humidity conditions. method. This standard does not specify acceptance limits for the stability of color products, but only proposes the test method for image changes of color pictures during aging, and the key image change parameters that should be calculated. This standard also does not specify which photostability test is most important. Density in this standard is expressed in dimensionless units. 2 Dark Stability Predicting the stability of color photographic images in dark preservation, based on the application of the Arrhenius method [3][4][5][6][7]. Although the method is derived from well-known and proven chemical theoretical rules, its validity for application and prediction of photographic image changes relies on empirical verification. While image fading and staining data obtained in both accelerated and non-accelerated weathering tests fit the Arinius relationship well for many chromophoric color products, some other types of products do not. 3 Photostability The method for testing photostability in this standard is based on the concept that, under typical viewing and display conditions, when the light intensity is increased without changing the spectral distribution of the lighting and the temperature and relative humidity of the surrounding environment, the photochemical reaction with the same proportional increase without causing any undesired side effects. Due to the failure of the reciprocity law, even though the total exposure (light intensity × time) is kept constant by adjusting the exposure time under high-illuminance illumination and low-illuminance illumination, the amount of fading or pollution of many dyes is not the same, the above assumptions Not all of them apply. Therefore, the accelerated photostability test method specified in this standard is only valid under the specified accelerated aging conditions. When using these data to predict the behavior of a product exhibited under normal conditions for a long time, sometimes the reliability is questionable.

GB/T 18117-2000 history

• 2000 GB/T 18117-2000 Photography-Processed photographic colour films and paper prints-Methods for measuring image stability