ISO 18944:2018
Imaging materials — Reflection colour photographic prints — Test print construction and measurement
This document specifies requirements and recommendations for the digital test file content, printer setups and printing procedures that are used to generate target prints for test method standards and specifications for image stability in the context of reflection colour photographic prints.
Furthermore, this document defines measurement procedures of the test patches as well as how changes of colour attributes are calculated in the course of a given image stability test.
Definition of the statistical procedure for data reduction and the translation of those changes into psychophysical end point levels does not belong to the scope of this document, but results obtained with the methods defined in this document can feed into the appropriate statistical evaluation and end point systems of a print life specification defined in other documents.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Requirements
5 Digital file preparation
5.1 Digital test file usage situations
5.2 Digital test file general requirements
5.3 Preparing the digital test file
5.3.1 Constructing the digital file
5.3.2 Adapting the digital file
5.4 Target print uniformity
6 Generating the target prints
6.1 Digital print preparation
6.2 Source preparation for conventional silver gelatine photographic materials
6.3 Configuring the printing system and generating the target prints
6.4 Conditioning the prints after printing
7 Target print holding and measurement conditions
7.1 Measurement timing
7.2 Holding and measurement conditions
8 Measurement of test patches
8.1 Measured attributes
8.1.1 General
8.1.2 Density attributes to be measured
8.1.3 Colorimetry values to be measured
9 Calculation of colour changes
9.1 General
9.2 Percent density change in primary colour patches
9.3 Percent density change in secondary (mixed) colour patches
9.4 Percent density change in composite neutral patch
9.5 Colour balance shift in composite neutral patch
9.6 Colour balance shift in secondary (mixed) colour patches
9.7 Colour balance in Dmin patches by colorimetry
10 Reporting
10.1 General
10.2 Test report
Annex A (normative) Required sRGB encoded patch values for test targets, tolerance in optical density (OD) and patch selection process
Annex B (informative) Method of interpolation for step wedge exposures
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Requirements
5 Digital file preparation
5.1 Digital test file usage situations
5.2 Digital test file general requirements
5.3 Preparing the digital test file
5.3.1 Constructing the digital file
5.3.2 Adapting the digital file
5.4 Target print uniformity
6 Generating the target prints
6.1 Digital print preparation
6.2 Source preparation for conventional silver gelatine photographic materials
6.3 Configuring the printing system and generating the target prints
6.4 Conditioning the prints after printing
7 Target print holding and measurement conditions
7.1 Measurement timing
7.2 Holding and measurement conditions
8 Measurement of test patches
8.1 Measured attributes
8.1.1 General
8.1.2 Density attributes to be measured
8.1.3 Colorimetry values to be measured
9 Calculation of colour changes
9.1 General
9.2 Percent density change in primary colour patches
9.3 Percent density change in secondary (mixed) colour patches
9.4 Percent density change in composite neutral patch
9.5 Colour balance shift in composite neutral patch
9.6 Colour balance shift in secondary (mixed) colour patches
9.7 Colour balance in Dmin patches by colorimetry
10 Reporting
10.1 General
10.2 Test report
Annex A (normative) Required sRGB encoded patch values for test targets, tolerance in optical density (OD) and patch selection process
Annex B (informative) Method of interpolation for step wedge exposures
Bibliography