Overview
SIST ISO 11315-1:2003 (equivalent to ISO 11315-1:1997) specifies standardized laboratory methods for measuring screen illumination in indoor rooms when using still projectors for photographic projection. This part of the standard focuses on testing the utilized luminous flux and the uniformity of screen illuminance to ensure reliable and comparable results across various projection setups. These procedures apply to all types of purely optical still projection in darkened rooms, supporting high-quality viewing and consistent testing methods throughout the photography industry.
Key Topics
- Screen Illumination Testing: Defines measurement methods for assessing the lighting on projection screens produced by still projectors.
- Luminous Flux: Establishes procedures to determine the projector’s usable light output (utilized flux) falling onto the screen.
- Uniformity of Illuminance: Describes how to measure and calculate the uniformity ratio (lowest to highest measured illuminance), ensuring even distribution of light for optimal image quality.
- Test Conditions: Specifies requirements for projector setup, ambient light control, environmental conditioning, lamp adjustment, and power supply stability during tests.
- Photometric Equipment: Specifies the use of light meters and photometers calibrated to internationally recognized standards, such as those defined by the CIE (Commission Internationale de l’Éclairage).
Applications
Implementing SIST ISO 11315-1:2003 supports:
- Projector Manufacturers: Enables testing, benchmarking, and quality control of still projectors under standardized conditions. Facilitates consistent measurement and product comparison.
- Laboratories and Test Facilities: Establishes a common approach for measuring screen illuminance, ensuring accurate, repeatable, and comparable results regardless of test location.
- Photography Studios and Museums: Assures optimal projection conditions for viewing photographic slides, transparencies, and similar media in indoor, darkened environments.
- Quality Assurance: Allows buyers and users to assess the performance of projection systems with respect to screen brightness and uniformity, influencing purchasing and setup decisions.
Benefits include:
- Enhanced projector performance evaluation
- Standardized reporting for regulatory or procurement purposes
- Improved viewer experience due to optimal and evenly distributed screen illumination
Related Standards
For a comprehensive approach to indoor photographic projection and measurement, consider these related standards:
- ISO 11315-2: Addresses the testing of screen luminance for both still and video projection.
- ISO 11315-3 & ISO 11315-4: Focus on projection reflecting screens and classification/measurement of reflected luminance and sound attenuation.
- ISO 2910: Provides guidelines for screen luminance in motion-picture projection.
- ISO 7943-1 & ISO 7943-2: Cover projection stages and transparency frame dimensions for overhead projectors.
- CIE Standards: CIE No. 15.2 (Colorimetry), CIE No. 17.4 (Lighting Vocabulary), and CIE No. 69 (Performance of Illuminance and Luminance Meters) inform calibration and measurement methodologies.
- ISO 1755: Details projector slide dimensions, influencing compatibility and effective projection area.
By applying ISO 11315-1:2003, organizations ensure that the performance of still projectors in indoor projection environments is accurately assessed, supporting high-quality photographic image presentation and facilitating global standardization in measurement and reporting of screen illumination.