Lab Dip Approval against Bulk Shade under Three Illuminants
Tri-illuminant shade approval aligns lab dips with bulk by enforcing primary D65 visual matching alongside secondary TL84 and Illuminant A metameric tolerances.
Spectrophotometer Sphere Geometry
Integration Chamber
Total integration of reflected light within a coated chamber allows for the measurement of color on textured or irregular surfaces. The use of spectrophotometer sphere geometry ensures that the light hitting the sensor is a perfect average of all the light bouncing off the fabric.
Surface Scattering
Diffused illumination from the interior walls of the sphere eliminates the shadows caused by the weave of the cloth. When using spectrophotometer sphere geometry, the orientation of the sample becomes less critical than with directional lighting. This setup is essential for measuring fleeces, towels and heavy knits where the surface is not flat.
It provides a more accurate reading of the actual dye concentration by ignoring the physical depth of the fabric texture.
Measurement Accuracy
Consistent results across different laboratories depend on the size and coating of the internal sphere. Standardized spectrophotometer sphere geometry allows a garment brand in one country to trust the digital color data sent by a mill in another.
Optical Exclusion
Most instruments allow for the inclusion or exclusion of the specular component to account for surface gloss. Applying spectrophotometer sphere geometry correctly prevents the shine of synthetic fibres from distorting the calculated color values.