Later in 1973, ICS (international color system), manufactured computer matching system commercially
The basic three things are important in CCMS: -
- Color measurement Instrument (Spectrophotometers).
- Reflectance (R%) from a mixture of Dyes or Pigments applied in a specific way.
- Optical model of color vision to closeness of the color matching (CIE L*A*B).
Functions of Computer Color Matching System:
- Color match prediction.
- Color difference calculation.
- Determine metamerism.
- Pass/Fail option.
- Color –fastness rating.
- Cost Comparison.
- Strength evaluation of dyes.
- Whiteness indices.
- Reflectance curve and K/S curve.
- Production of Shade library. Etc.
Computer Color Matching System (CCMS) has lots of great advantages in Textile Industry. See some examples below –
Customers get the exact shade wanted with his knowledge of degree of metamerism.
Customers often have a choice of 10-20 formulation that will match color. By taking costing, availability of dyes, and auxiliaries into account, one can choose a best swatch.
3 to 300 times faster than manual color matching.
Limited range of stock color needed.
Measuring Special colors
Measuring Fluorescent colors Read here Fluorescence and color
When a fluorescent color is measured by the spectrophotometer, the spectral power distribution of the light source, including the ultraviolet regions, must be controlled.
Measuring Mettalic colors
when measuring metallic colors, it is more effective to measure and evaluate them with a spectrophotometer that measures color at multiple angles
Measuring Powder objects
When measuring powder with a spectrophotometer, the measurement value varies depending on the density of the powder and the surface conditions. To avoid errors, special methods are required such as placing a fixed amount of powder into a container of a fixed shape and size and maintaining a fixed surface quality.
If the size of the particles is large, use a spectrophotometer which has a large measurement area, so the measurement surface is averaged and repeatable measurement values can be obtained.
Measuring Transparent objects
The measurement of semi-transparent objects requires special consideration because the light might pass through the material and the measurement may be influenced by what is behind the object. To solve this problem, increase the thickness of the object to prevent the light from being transmitted completely. Another solution is to put an opaque white surface behind the object.Measuring Objects Containing Patterns
When measuring objects that have patterns or textures, the measurement value varies according to the location if a small area is measured. The largest possible measurement area should be used, or measurements should be taken several times in different locations and then the average measurement value should be calculated.
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