What is the Relationship between Surface Gloss and Color Difference?
1. What is gloss and color difference?
To understand the relationship between gloss and color difference, we must first understand their definition.
(1) Gloss
The degree to which the gloss is expressed by the number of the object surface close to the mirror surface. Various methods (or instruments) can be used to evaluate the glossiness. It mainly depends on the angle of illumination and observation of the light source. For the gloss measurement, we can choose different measurement angles 20 °, 45 °, 60 ° or 85 °. Different gloss measurement angles are used for different industries.
(2) Color difference
Chromatic aberration: chromatic aberration, also known as chromatic aberration, is a serious defect of lens imaging. Chromatic aberration is simply a difference in color. It occurs when polychromatic light is used as a light source and monochromatic light does not produce chromatic aberration. The principle of colorimeter measurement is actually determined by reflected light.
In simple terms, glossiness is the ability to reflect light on the surface of an object. And color difference is the difference in surface color.
2. Relationship between gloss and color difference:
We know that the reason why the colorimeter can measure the color of the object is because when the light hits the object, the object surface will be refracted. It's like when the elastic ball rebounds back against the wall, the projection angle is the same as the rebound angle. The light reflected from different directions at the same angle due to the illumination of the light source is called specular reflection. There are also some light reflections that are not specular reflections, they are scattered in all directions, which we call slow reflection.
In the case of high gloss, which means that the object surface is smooth and bright. The light reflected by the mirror surface is stronger than the diffuse reflection. For the same reason, diffuse reflection is stronger on the surface of objects with low gloss. Therefore, the tested samples above show that when they are smooth, they will look at brighter and the tested samples after rubbing are relatively darker. It is easy to ignore the specular reflection factor when people are observing the color of an object. However, it is easy to find this problem when measuring with a colorimeter. However, the reason for analyzing the color change is to not ignore the interference of specular reflection.
3. The difference between portable gloss meter and colorimeter:
① Difference 1: Use
Portable gloss meter and the colorimeter has different usage, one is to detect the gloss of the product surface and the other is to check the difference in product color.
② Difference 2: Different test angles
The commonly used test angles of the portable gloss meter are 20 degrees, 60 degrees and 85 degrees. As the portable gloss meter manufacturer, Linshang Technology provides a series of portable gloss meters with simple operation. It can be applied to the gloss test of paint, coating, ink, plastic, paper, ceramic tile, stone, metal, electroplated layer.
Colorimeter test angle is 8 / d (8 ° illumination / diffuse light reception), including specular reflection light (SCI)
③ Difference 3: Main technical characteristics
Glossmeter: The portable gloss meter is composed of an emitter and a receiver. The emitter is composed of an incandescent light source and a group of lenses, which produces a certain required incident beam. The receiver is composed of a lens and a photosensitive element and is used to receive the cone beam reflected from the sample surface.
Colorimeter: Simulate D65 illuminator lighting. Adopt CIE 1964 supplementary chromaticity system and CIE 1976 (L * a * b *) color space color difference formula.
The above is the relevant information of color difference and gloss, we hope it can help you!