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Training Overview
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Knowledge related to Color and Measurements
- Standard CIE Illuminants
- Color Difference Formulas
- Realistic ∆E values
- Color Measurements
- Maturity of Color Definition
- Spectrophotometer vs Colorimeter
- Instrument Geometry
- Metamerism, Color Inconstancy Index
- Metamerism in practice
- Aperture • Screen Ruling • Patch Size
- Scan mode: Understanding of Aperture, Patch Width, Scanning Speed relationship
- Understanding variation
- Measurement Backing
- Understanding SCCA
- Fix the Lighting Condition first
- Second step: standarize your Display
- Create spectral Color Standard (multi M-conditions)
- Define a Tolerance
- Color Specifications and Measurement Conditions
- Color Knowledge Database - 3rd party resources
- OBAs
- When ∆E might be not enough
- Global Color Inspector Preferences
- Custom Illuminant
- Designer's Guide
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Spot Ink formula in the production chain
- Guide for Color Experts ( CC Champions)
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ISO Standards
Color Measurements
Typically we are using reflection mode where we measure light reflected from the object. Pigments, colorants, and dyes on the sample surface absorb a portion of the light used to enlighten. Today we have two basic types of instruments capable to measure the color of the sample:
- colorimeters - capable to return colorimetrical coordinates
- spectrophotometers - where we get information on reflection split into wavelength bins
To learn more about the differences read the document: Spectrophotometer vs Colorimeter which answers the question:
How do the instruments see color?
Another document: Maturity of Color Definition explains the steps of advancement levels.
Lab, LCH, RGB, XYZ, CMYK, ...
There are a lot of color spaces used for the color description. Most users used to think that if they specify color in Lab or RGB that is a precise color definition, while it is not if we don't specify which Lab, RGB or CMYK space we are thinking about.
CIE Lab D50/2° ≠ CIE Lab D65/10°
CIE Lab ≠ Hunter Lab
sRGB ≠ Adobe RGB
CRPC2 CMYK ≠ GRACoL CMYK
It is also very important not to mix:
- Color Specifications
- Measurement Geometry
- Measurements Conditions
- Color difference formulas
There are a lot of very good sources of general color science knowledge - we can recommend some of them!
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