Brightness of Paper

Test theory and paper brightness are important for decision and understanding because paper brightness directly affects print quality and job color. Because the test measures the amount of diffuse light reflected from the surface rather than the visible amount, "bright" paper can be blue, red, green or other colors so brightness is the "whiteness" of paper It is different. Spectral Reflection Paper brightness as defined in Tappi T 452 is determined by the percent reflectance of blue light measured at 457 nm by comparing the sample to the ideal white standard (Goyal, 2000).

Paper brightness is measured using a special blue light with a scale from 1 to 100. 100 will be the brightest. The brightness of the paper affects the contrast, which also affects the readability of the printed matter. The brighter the paper, the easier it is to read. The brighter paper becomes yellower and the color becomes somewhat confusing, so bright paper is more accurate, brilliant and purely able to display ink colors. This makes glossy paper suitable for printing of the highest quality for high end advertising and reproduction of artwork. Brightening the paper increases the popularity of the color and makes it look good. Dark paper can be used to darken or soften the color of certain types of images, but in general, bright paper is more suitable for color design.

Brightness represents the ratio of the wavelength of the blue light reflected by the paper. It is usually expressed on a scale of 1 to 100, 100 is the brightest. Most papers reflect 60 to 90% of the light. Paper brightness can affect the readability, recognition of ink color, and the contrast of bright tone and dark tone. For the art poster, silk or glossy coated paper is preferred. Which should depend on the photo of the poster and the amount of illustration work. For brighter, more saturated colors, it is also good to use woodfree paper, so colors are very popular. Coated paper is also strong against dirt and dirt, sometimes it is strong against simple physical damage