by clicking the arrows at the side of the page, or by using the toolbar.
by clicking anywhere on the page.
by dragging the page around when zoomed in.
by clicking anywhere on the page when zoomed in.
web sites or send emails by clicking on hyperlinks.
Email this page to a friend
Search this issue
Index - jump to page or section
Archive - view past issues
FLEXO Magazine : February 2008
differences in dark colors versus lighter pastels. The rectangular coordinates a and b represent the major color axes, with red at positive a, green at negative a, yellow at positive b and blue at negative b. The intermediate hues are between the major color hues of red, yellow, green and blue. Given a specific L, a, b value, a number for lightness, one for the amount of red or green, and one for the amount of yellow or blue, it is possible to quickly plot a unique position on the map. Hunter's Lab model persisted unchanged for more than 30 years and became a widely used method for plotting both color and color difference. THE CIE L*A*B* MAP While Hunter's Lab was quickly adopted as the de-facto mod- el for plotting absolute color coordinates and differences be- tween colors, it never achieved the status of a formally accepted international standard. Thirty-one years passed, and in 1976, the CIE (International Commission on Illumination) published FIGURE 3. The angle where gloss is minimized and color is most enriched is at an angle of 45º. Figure 4. How a spherical instrument works. TECHNOLOGIES & TECHNIQUES