Overview
ISO 19307:2026, published by the International Organization for Standardization (ISO), establishes a standardized procedure for the measurement and one-parameter representation of translucency in flat materials that both absorb and scatter light. The standard introduces the concept of translucency alpha (α), a one-dimensional parameter designed to quantify and communicate translucency magnitude objectively. Translucency alpha provides a robust and reproducible way to represent material translucency, supporting accurate appearance reproduction in 3D workflows, particularly in graphic technology and 3D printing.
While ISO 19307:2026 is tailored for 3D printing scenarios, its methods and the α parameter have broad relevance across any application requiring the representation or comparison of material translucency, regardless of manufacturing or reproduction technology.
Key Topics
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Definition of Translucency Alpha (α):
- Translucency alpha quantifies the magnitude of light scattering and absorption, offering a standardized material property for describing translucency.
- Enables consistent communication of material translucency across digital workflows and devices.
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Measurement Procedures:
- The standard specifies detailed sample preparation requirements (flat and smooth surfaces, set dimensions).
- Relies on colorimetric reflectance and transmittance measurements under controlled lighting (CIE D50) and observer conditions, as outlined in ISO 13655.
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Lateral & Vertical Light Transport:
- Distinguishes between how light is diffused within materials (lateral light transport: blurring of textures; vertical light transport: transmission revealing occluded objects).
- These two phenomena fundamentally determine perceived translucency and are integral to the measurement procedure.
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Virtual Reference Materials:
- Translucency alpha is referenced to a set of wavelength-independent virtual materials with defined absorption and scattering properties.
- The right reference is selected by matching actual measurements to simulated outcomes, ensuring repeatability and comparability.
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Adjusting for Scale:
- ISO 19307:2026 provides guidance for scaling translucency alpha when reproducing the same object at different sizes-critical for 3D printing applications to ensure visual consistency regardless of model scaling.
Applications
ISO 19307:2026 enhances reliability and consistency for a wide range of practical applications:
- 3D Printing & Additive Manufacturing: Ensures accurate material appearance reproduction, supporting color and translucency matching in digital fabrication workflows.
- Digital Graphic Arts: Facilitates exchange and standardization of translucency information in design files (e.g., RGBA formats), improving color management and visual consistency across devices and media.
- Quality Control: Supports objective, repeatable measurement of translucency for flat materials in production or research, aiding material selection and product specification.
- Simulation and Rendering: Enables better input parameters for rendering engines and physical-based path tracing, leading to more faithful digital representations of real-world translucent materials.
Related Standards
Professionals implementing ISO 19307:2026 may also reference the following standards for comprehensive workflows in graphic technology and color measurement:
- ISO 13655: Graphic technology - Spectral measurement and colorimetric computation for graphic arts images. Provides the underlying measurement protocols used in ISO 19307:2026.
- ISO 20795-1: Dentistry - Base polymers - Part 1: Denture base polymers. Offers definitions and context for translucency as it applies to polymers.
- 3D File Format Standards: Many common 3D file formats (e.g., those supporting RGBA channels) can utilize translucency alpha to ensure consistency between digital and physical renderings.
Aligning with ISO 19307:2026 promotes standardized communication of translucency values, boosts reproducibility in 3D printing and graphic arts, and enables higher fidelity in the visual and tactile representation of translucent materials.