Colour shade measurement and grouping of fabric rolls
Fabric is imaged in an illuminated cabinet while rewinding on the inspection machine. Edge-to-centre and head-to-tail colour differences are compared with the reference shade; the shade group is written to the roll label.
The roll shade group and colour-difference profile are linked to the production record. The group is printed on the roll label; an out-of-range difference alerts the operator.
- 01 Rewind
- 02 Reference light
- 03 Colour image
- 04 Shade difference
- 05 Group label
Fabric passes through the inspection cabinet.
- Edge-to-centre difference
- —
- Head-to-tail difference
- —
Scenes are illustrative simulations; they are not customer references or performance guarantees.
Need
Weave direction, wrinkles and ambient light change the apparent shade. Edge-to-centre and head-to-tail differences must be compared under the same light and reference.
Solution approach
A calibrated overhead colour camera views fabric in a diffuse cabinet with fixed illumination conditions. Colour differences of edge-centre-edge regions are calculated against the reference; metre position supports head-to-tail comparison and group boundaries are validated with samples.
Process steps
- 01
Rewind
Fabric passes through the inspection cabinet.
- 02
Reference light
Diffuse light limits ambient effects.
- 03
Colour image
Colour regions are captured across the width.
- 04
Shade difference
Edges, centre and roll positions are compared.
- 05
Group label
The shade group is written to the winder label.
Related applications
Let us assess your application together
We test your sample in our laboratory and report on resolution, optics and lighting selection.