Graphic technology. Spectral measurement and colorimetric computation for graphic arts images

BS ISO 13655:1996 Graphic technology. Spectral measurement and colorimetric computation for graphic arts images

BS ISO 13655 establishes a methodology for reflection and transmission spectral measurement and colorimetric parameter computation for graphic arts images. Graphic arts includes, but is not limited to, the preparation of material for, and volume production by, production printing processes which include offset lithography, letterpress, flexography, gravure and screen printing.

BS ISO 13655 does not apply to three-filter (tristimulus) colorimeters although Annex B, Annex D, Annex E, Annex F and Annex G may also be relevant to those instruments.

BS ISO 13655 applies to colour measurement of limited volume reproductions of coloured images such as those produced with photographic, ink jet, thermal transfer, diffusion, electro-photography, mechanical transfer or toner technology (e.g. off-press proofs) when used for graphic arts applications.

BS ISO 13655 does not address the spectral measurement of light emitted by video monitors nor does it supersede the specification of other measurement geometries appropriate to specific application needs, such as the evaluation of materials (e.g. ink and paper) used in the graphic arts.

Contents of BS ISO 13655:

Foreword

Introduction

1 Scope

2 Normative references

3 Definitions and abbreviations

4 Spectral measurement requirements

5 Colorimetric computation requirements

Annex A Procedures for widening the bandwidth of narrow bandpass instruments

Annex B Computation of CIELAB, CIELUV and CMC(l:c) parameters

Annex C Spectral weights for illuminant D65 and 2° observer

Annex D Sample backing material

Annex E Measurement geometry

Annex F Aperture size in reflectance measurements

Annex G Fluorescence in measurement

Annex H Improving inter-instrument agreement

Annex J Bibliography

Table 1 — Weighting factors (W) for illuminant D50 and 2° observer for calculating tristimulus values at 10 nm intervals 4

Table 2 — Weighting factors (W) for illuminant D50 and 2° observer for calculating tristimulus values at 20 nm intervals 4

Table C.1 — Weighting factors (W) for illuminant D65 and 2° observer for calculating tristimulus values at 10 nm intervals 9

Table C.2 — Weighting factors (W) for illuminant D65 and 2° observer for calculating tristimulus values at 20 nm intervals 9

Table F.1 — Minimum recommended aperture size 13