Textured fabrics contain peaks, valleys, loops, fibres and shadows inside every measurement area. Pile can lean or crush, local thickness changes the backing contribution, and gloss is redistributed over many angles. Reliable color data therefore requires a defined geometry, aperture, pile state, contact pressure and sampling plan.
How texture changes a reading
| Source | Possible effect | Control |
|---|---|---|
| Loops and coarse knit | Different proportions of fibre and shadow enter each reading. | Use the largest practical viewed area and sample multiple positions. |
| Raised or brushed pile | Nap direction and compression alter lightness and sheen. | Define brushing, direction, contact and recovery time. |
| Open construction | Backing shows through and changes the spectrum. | Specify layers or backing and avoid uncontrolled stretch. |
| Embossed or quilted structure | Placement changes which relief features dominate. | Use a location pattern or fixture tied to the repeat. |
Choose geometry and aperture for the decision
A d/8 sphere with SCI generally reduces sensitivity to some gloss and texture differences and can be useful for closer control of colorant. SCE excludes the specular component and is more sensitive to surface finish. Because textured surfaces scatter first-surface reflection broadly, neither condition removes every texture effect. A directional 45°/0° or 0°/45° arrangement may correlate with a defined visual judgement but can be more orientation-sensitive.
Use the largest aperture that fits a representative, stable area. A small aperture may be necessary for a motif or rib, but it also increases sensitivity to exact placement. Instrument geometry and aperture must remain identical for standard and sample.
Control pile state and contact pressure
- Condition the textile and allow compressed pile to recover before measurement.
- Define whether specimens are measured as received, brushed in one direction or prepared by a specified routine.
- Keep the port light-tight without crushing the material differently between readings.
- Use a fixture or controlled weight for soft, lofty or curved constructions.
- Do not steam, iron or flatten the specimen unless that treatment is part of the approved method.
Build the sampling plan around real variation
First take repeated readings without moving to quantify instrument repeatability. Then lift, recover and reposition the specimen across defined locations. If pile direction is relevant, repeat the sequence at the specified orientation. Retain individual values and range: a close mean can hide stripes, barré or local finishing variation.
Do not chase a lower Delta E by pressing harder
Changing pressure or flattening can create a more repeatable number while making the specimen unlike the product seen by the customer. Validate the presentation against accepted and rejected fabrics.
Separate color from appearance
Close SCI values with larger SCE or directional differences may indicate similar colorant with a finish or pile difference. A color spectrophotometer does not automatically quantify gloss, roughness, pile height or lustre. When those attributes affect acceptance, pair the color method with a visual assessment and the appropriate appearance test.
References and further reading
- ISO 105-J01: textile surface-color measurement.
- ASTM E1164: spectrometric data for object-color evaluation.
- How to Measure Color on Textured Surfaces.
Continue with directional fabrics, fabric preparation and fabric tolerances.
Last reviewed 22/09/2026 · Level: Intermediate
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