What is Grayscale? How to use Grayscale. Definition of Grayscale.

   What is GrayScale?  About Textile Industry
GrayScale consists of 9 pairs of non-glossy gray color chips which highlight the perceived color differences corresponding to fastness ratings.
5 (no visual change, best rating) , 4-5, 4, 3-4, 3, 2-3, 2, 1-2, 1 (a large visual change, worst rating)
Main features of GrayScale are as follows;
Ratings 1 – 5 with Half Steps
9 Steps
Neutral Gray steps
Non Glossy
Can be compared with Spectrophotometric ratings
Steps in a GrayScale.
There are total 9 steps;
1 Poorest
1-2
2
2-3
3
3-4
4
4-5
5 Best
Components of Grayscale Assessment.
Envelope of Grayscale
Grayscale Wallet
Grayscale (with 9 Steps)
Sample Cover Card
Types of GrayScale.
Two Types of GrayScales;
Grayscale for Assessing Shade Change (BS EN ISO A02)
Grayscale for Assessing Staining (BS EN ISO A03)
Grayscale for Assessing Shade Change – BS EN ISO A02
This GrayScale is used for assessing the Degree of Shade Change caused to a Garment / Fabric.
Total 9 pairs of Gray Chips
In Number 5, there is no color difference between chips, and both have identical neutral Gray color
The first member of each pair is neutral Gray in color and the second members of each of the pairs are increasingly lighter in color.
Number 4-5 to 1-2 show intermediate contrast
Number 1 Grayscale shows the greatest contrast
Terminology
Target Sample
Customer approved sample / Shade Standard / Shade Card
Production Sample
Sample taken from production (Garments) batch / whose shade is to be checked.
Use of Grayscale
Place Target Sample and Production Sample side by side
Place Grayscale in the same angle as Target Sample and Production Sample
Background should be neutral Gray
Lighting (lux level) should be minimum 600
The rating of the Grayscale is the step, which has a shade difference nearest to the shade difference between the Target Sample and Production Sample.
A rating of 5 is given only when there is no difference between the Target Sample and Production Sample
When a number of batches are being checked, it is very useful to compare all Production Samples which have been given the same rating against Target Sample.
In this way consistency of assessments can be checked.
Production Samples from batches which do not appear to have the same contrast as remaining Production samples should be re-checked against the Grayscale and, if necessary, the rating should be changed.
Grayscale for Assessing Staining – BS EN ISO A03
This Grayscale is used for assessing the Degree of Staining caused to a adjacent fabrics in color fastness tests.
Total 9 pairs of Chips
In Number 5, there is no color difference between chips, and both have identical white color (No staining)
The first member of each pair is White in color and the second member of each of the pairs are increasingly Darker in color
Number 4-5 to 1-2 show intermediate contrast
Number 1 Grayscale shows the greatest contrast
Grayscale use in Color Fatness Tests