Color description in CieL*a*b* space | | UPV
Title: Color Description in CieL*a*b* Space
Description: This video describes how we can describe the color of an object using the CIELAB color space. Talens Oliag, P. (2018). Color Description in CieL*a*b* Space. Universitat Politècnica de València. http://hdl.handle.net/10251/102415
Automatic Description: This video explains how to describe the color of an object using the CIELAB color space, recognized for its uniformity and popularity in various industries, such as food, textiles, and plastics. It mentions that the usual perception of color, such as saying that an apple is green, can be inaccurate due to visible differences between objects of the same color.
Color is defined through three attributes: hue, lightness, and purity. Hue relates to visual sensation and comparison with perceived colors, such as red or green. Lightness indicates how much light a surface emits, and purity is based on the color content in proportion to the luminosity. Based on this, objects can be chromatic or achromatic.
The CIELAB space is represented as a sphere and three axes: L for luminosity, with values from 0 (black) to 100 (white), and a and b for chromatic color coordinates, with values from -80 to +80. Chromatic stimuli are described on the sphere based on the central axis L. Horizontal or vertical slices are often used to generate chromatic planes that facilitate the description of luminosity and hue/color purity.
With these concepts, the total color difference between two objects can be measured using the Delta E parameter. Values below three indicate barely perceptible differences, while values above five are more clearly discernible by the consumer.
By applying these principles to two apples, one can observe and calculate how one has greater luminosity and color purity than the other. Furthermore, using a spectrocolorimeter, the color coordinates L, a, and b can be obtained and placed on the LA and BA chromatic planes for a detailed description. It is concluded that the color difference between the apples is perceptible, with a delta of approximately 8.57 units.
Author: Talens Oliag Pau
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#color #luminosity #purity #hue #FOOD TECHNOLOGY #Physical Properties of Food II 11195 / S - Double Degree. Degree in Agro-Food and Rural Engineering and Degree in Food Science and Technology 208