Ugra light indicator and Ugra metamerism card – A Simple light tool to see colors right

Posted: September 7, 2012 in Color, color swatch, digital proofs, INK, ISO Press standardisation, light, light frequencies
Tags: , , , ,

How many you have wondered why the color you see when printing is different when your customer see in his room?  Have your ever faced an unhappy customer who was upset because the colors were not upto his expectations, whereas when you printed you felt it is more than his expectations?

If you say yes to any one of the above questions, then you are suffering from “Metamerism” issue.

What is Metamerism?

Metamerism is a phenomenon in day to day life of a common man. It occurs, when a color swatch and a sample matching in one light source “differ” in another source of light. A typical example is the problem faced by a common man when a product purchased after matching in showroom light is not matching anymore at home. The object/product match in store under – typically- fluorescent light and they don’t match under incandescent light or day light. The phenomenon is metamerism and the two colors showing the above property are called metameric pair. The fundamental reason for metamerism is that color is a sensation rather than a property of an object. The eyes can register the same sensation from an infinite variety of combinations of different light frequencies. Hence, it is imperative to discuss more about source of light, the object and the observer.

So how to Counter it?  A simple light tool for Viewing right Color

The colors of modern digital proofs depend very heavily on the light source used (metamerism). It is therefore important that they are always assessed under a standard light of D50 (5000 K). If a light source with an incorrect color temperature is used, the colors of the proof shift and an assessment is meaningless. With the Ugra light indicator it can be easily deducted whether the light source corresponds to standard light and whether an assessment is valid.

 The Ugra light indicator is used for the visual checking of the color temperature of illuminations for color assessments. For this purpose, the Ugra light indicator is attached to the margin of a proof, where it signals whether the illumination used emits the standard color temperature of 5000 K. If a standard color temperature of 5000 K is used, the patches of the Ugra light indicator appear in the same green color. If the color temperature differs from 5000 K, the patches of the Ugra light indicator show different colors.

 The 9 mm x 75 mm indicator strips have a non-permanent adhesive on the reverse side. This means that they can be attached to the margins of proofs, prints or other objects which have to be viewed under a standard illumination of 5000 K.

The light tool to see things right

Metamerism light indicator

The Ugra metamerism card has a size of DIN A5 and will be used for the control of the illumination. It has the same function as the Ugra light indicator.

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