Do you really understand about “jumping lights”?
When dealing with brand owners or dyeing factories, we often encounter a requirement: the samples should not have “Tiao lights”;
Because it is a colloquial term, as for: ” There is no standard rule for “turning on the lamp” or “jumping on the lamp”.
Often we equate “tiaolantern” with “metamerism”, but the author summarized the actual application information obtained by the factory and believes that the above two ways of writing have different meanings.
Explanation 1: “Carrying the light”
Generally speaking, the phenomenon of “burning the light” refers to the phenomenon of “metamerism”:
Two colors Samples (one standard and one comparison sample), under a certain light source (such as D65), appear to be metachromatic (no color difference or small color difference), but under another light source (such as A), there is a large color difference. We call it the “metamerism” phenomenon
We can describe this situation by “burning the light”. In other words, whether the comparison sample can match the color of the standard sample requires “selecting” a specific light source.
The essential reason is that the two samples have different reflections of light (different reflection spectrum curves or visible band reflectivities), so it is called “Metamerism”.
The reasons for “different spectrum” are:
A. The pigment composition for dyeing is different;
B. The processing methods are different
Explanation 2: “Light Jumping”
In fact, in addition to the above meaning, the “flying lantern” we talk about in daily life also has another meaning:
Refers to the dramatic color change of a single color sample under different light sources. At this time, it can be described as “jumping light”.
So, “jumping lights” can also be said to be a sample.
For example, CIBA’s dye engineer will say when recommending the dye CIBA DEEP RED: This dye does not jump red under the A light.
(The author understands what he means is that although the A light source contains a large amount of red and yellow light, the dye CIBA DEEP RED will not feel much redder than under the D65 light source.)
In fact, this situation is also called “color variation” “Or”Color Inconstancy”
Specific application:
For example
Gap color manual stipulates (3.4.16.5.1):
If the direction of the flare is the same and the magnitude of the color submission’s flare is less than the standard. (The CI usually supports that by being less than the standard’s CI.)
The same submission is allowed.
MI here is the “Metamerism Index”, and CI is the “Color Inconsncy Index”
In other words, two light sources Although the MI exceeds the requirements, this is because the CI of the standard sample is greater than the CI of the comparison sample, causing the MI to be too large. Gap allows the submission of this comparison sample.
Use colloquial description:
If a set of standards and comparison samples “jumps” under certain two light sources, and the “jumping light” of the “standard sample” is larger than the “jumping light” of the “comparison sample”, Submission of this sample is allowed.
Ha, isn’t this description dizzying? </p
