February '13

For the Business of Apparel Decorating

Issue link:

Contents of this Issue


Page 31 of 108

the viewer, there would be no sensory response that would recognize the wavelengths as a unique color. In short, color exists in the mind and we merely associate them to the name. In order to perform color recognition in a timely way, our brain mass-processes the spectral data by breaking it down into its most dominant regions: red, green and blue. Mixing these dominant colors (RGB), called "additive primary colors," in different combinations and varying intensities can closely simulate a full range of colors of nature. If the reflected light seen by the eye contains a mix of pure red, green and blue, the eye perceives a color close to white. If no light is present, black is perceived. And, combining two, pure additive primary colors results in a perception of a subtractive primary color. The subtractive primary colors of magenta, cyan and yellow are the opposing colors to red, green and blue. For the purpose of our discussion, mixing RGB colors in equal proportions produces white, while mixing CMYK colors in equal proportions results in black. It is, however, important for you to remember that the range of colors that can be represented in CMYK and RGB are different. Many of the devices we come in contact with daily like displays, the principals of RGB govern digital cameras and scanners. The printers we use are most often CMYK. Color models A color model is a system used to organize and classify colors according to a set of basic properties. We have already touched on two: (1) Red, Green and Blue (RGB) and (2) Cyan, Magenta, Yellow and Black (CMYK). The two others you may come in contact with are HSB/HLS and Lab. Rather than using a set of primary colors, the HSB color model defines color using three different characteristics: •Hue (H)— the property of color that allows us to classify it by name. (I.e. blue, green and red are all hues.) Specifically, a hue is defined by its spectral wavelength. •Saturation (S)—the purity or vividness of a color that expresses the amount of departure from a gray of the same lightness. A color that is 100 percent saturated contains no white. Therefore, all grays have 0 percent saturation. •Brightness (B)—the dimension of color that refers to scale of black to white (gray scale) and is therefore a measure of how much white a color contains. A brightness value of zero is black, while the brightness value of 255 is white. Brightness and saturation are often confused. The HLS (hue, lightness and saturation) model is similar to HSB by substituting lightness percentage for brightness. The L*a*b* color model is based on human perception. The L*a*b* color space is defined by lightness (L), and two chromatic ranges: green to red (a) and the other, blue to yellow (b). The L*a*b* color space includes all perceivable colors, which means that its gamut exceeds those of the RGB and CMYK color models. L*a*b* is based on a widely- "'s like printing pretreatment only where you need it on the shirt." Coming Soon! Pretreating digitally printed garments will never be the same! The BelQuette EdgeTM Targeted Pretreatment System is unlike any automated pretreating machine available. The EdgeLINKTM software utilizes the white layer file that your RIP software generates to print the white underbase which produces a unique "mask" that is targeted to only where the image will be printed. Call us now for more information or to schedule a demonstration! 877.202.0886 Use Info # 259 | 2013 February Printwear PW_FEB13.indd 27 | 27 1/16/13 4:46 PM

Articles in this issue

Links on this page

view archives of Printwear - February '13