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[Expertise] What is the gloss?
25/06/2024
What is gloss?
When we look at a metal object visually and it is illuminated by light, the reflective effect is called "gloss". However, everyone has different feelings about the degree of gloss, so it is necessary to use instruments to standardize and digitize it. Regarding the principle of light projection, we use the following two pictures to briefly explain each:
First, we first set the input light as "incident light", and select a material surface as the "reflective surface", with an angle of 90 degrees to the reflective surface as N.
When light is thrown into the reflective surface, an incident angle i is obtained (as shown in Figure 1). When the material surface is a smooth plane, the reflection angle r of the reflected light will be the same as the incident angle i, and a normal reflected light will appear. Visually what we observe is like a mirror effect.
When the incident light is thrown into the reflective surface, the reflected light cannot be projected normally and is diffused. What is observed through visual inspection is the roughening effect.
Common names for gloss
GLOSS UNIT (GU): Glossiness unit
GS: represents the incident angle of light (GS60=> incident angle 60 degrees)
Gloss measuring instrument
A common gloss meter is shown on the right
Single angle gloss meter YG60
Measurable value 0 ~ 1000 GU
Similar models are commonly used on the market
