What does lab means in Hunter Lab color system?
The L value for each scale therefore indicates the level of light or dark, the a value redness or greenness, and the b value yellowness or blueness. All three values are required to completely describe an object’s color. A three-dimensional representation of L, a, b color space is shown below. Hunter l a b.
How is the hunter color lab calibrated?
All HunterLab instruments have their calibrated white tile data stored in ROM on the Signal Processing (SP) or Data Aquisition (DA) board. When the instrument is powered on this data is moved to RAM. The Diagnostic software supplied with each instrument does have the capability to load white tile data to ROM.
What is HunterLab colorimeter?
Uniquely designed for the food industry, our spectrophotometers and colorimeters are uniquely designed to provide calculations in a number of color measurement scales; for example, L, a, b, APHA color, Gardner color scale, the ASTM E313 for yellowness index, and the CIE lab color scale of L*, a*, b*.
What is Hunter L?
The three values utilized by Hunter are L, or luminosity (the degree of lightness from black to white), ± a, the degree of redness or greenness on a scale from red to green, and ± b, the degree of yellowness to blueness on a scale from yellow to blue.
Why is color measurement important for food?
Color measurement systems are used to measure a broad range of food products. Because reflected light determines the color of a material, the appearance can change depending on amount of light, the light source, the observer’s angle of view, size, and background differences. • Classification of Foods.
How calorimeter is different from spectrophotometer?
In chemistry, they are especially used to measure colour absorption by solutions. The main difference between colorimeter and spectrophotometer is that colorimeter is a device which measures absorbance of specific colours, whereas a spectrometer measures transmittance or reflectance as a function of wavelength.