Colour of The Paper Substrate
Paper shade plays a significant role in the quality of colour reproduction. The shade of the paper affects the colour values of the primary and secondary colours and hence the colour gamut of a press. The standard for paper shade of newsprint as per ISO 12647-3 is mentioned in the table.
| Backing | L* | a* | b* |
|---|---|---|---|
| Black backing | 82 | 0 | 3 |
| White Backing | 85.2 | 0.9 | 5.2 |
The maximum tolerance specified is ∆L 4, ∆a 2 and ∆b 2. When selecting a paper for production, it is very important to measure the paper shade. A spectrophotometer or a spectrodensitometer can be used. Publishers should also check for batch to batch variations. The ultimate aim is to use the paper which has a shade closer to ISO specification.
Read more about this topic: Paper And Ink Testing
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