ISO 12641-2:2019 PDF

Overview

ISO 12641-2:2019 - Graphic technology - Prepress digital data exchange - Part 2: Advanced colour targets for input scanner calibration defines a framework for creating, measuring and reporting reflective and transmissive advanced targets used to calibrate and characterize image-capturing devices. It complements ISO 12641-1 by addressing modern requirements for higher colour fidelity (especially darker, saturated and pastel patches) and mandates modern data-exchange formats (CxF/X-2) for target metadata and measurements.

Key topics and technical requirements

• Scope: Framework for advanced target layouts and colorimetric values for scanners, digital cameras and other input devices (self-emissive targets not covered unless simulated).
• Colorimetry basis: Measurements referenced to D50 illuminant and the CIE 1931 2° Standard Observer; colorimetric computation in accordance with ISO 13655.
• Target design & layout:
  • Main body (sampled colour area) + identification section; rectangular planar shapes for x–y scanners.
  • Minimum patch count: greater than 288 patches.
  • Minimum patch size: 2 mm × 2 mm.
  • Non-patch areas must be neutral (max CIELAB C = 3.5*, lightness ~50, with ∆E*