Sandusky C L, Heath J L
Department of Poultry Science, University of Maryland, College Park 20742, USA.
Poult Sci. 1996 Nov;75(11):1437-42. doi: 10.3382/ps.0751437.
The effects of sample thickness (0.5, 1.0, and 1.5 cm), background color (white, pink, green, and gray), and illuminant (D-65, A, and F) on color measurement of broiler tissue were determined. Color values from the anterior portions of the two Pectoralis superficialis muscles were not different from each other, allowing one to be used as a control for the other. Light penetrated the thinner posterior portions of the muscle and was reflected by the white background, producing different L*, a*, and b* values when compared to the thicker anterior portion of the muscle. These changes could alter or mask color changes in the tissue. Light penetrated 0.5 cm thick sliced breast, ground breast, and ground thigh samples and was reflected by the background in large enough quantities to cause color differences (P < 0.05) when both sample thickness and background colors were compared. White and pink backgrounds reflected the largest amount of light, followed in decreasing order by green and gray. The light reflected by background decreased as sample thickness increased from 0.5 to 1.0 cm and no differences due to reflection occurred in the 1.5 cm thick samples. Background reflection can prevent measurement of true sample color. The three illuminants produced different (P < 0.05) color values depending on the major wavelength characteristics of each illuminant. Illuminant choice should depend on wavelength characteristics of the illuminant, sample color, and the color values to be measured.
测定了样品厚度（0.5厘米、1.0厘米和1.5厘米）、背景颜色（白色、粉色、绿色和灰色）以及光源（D - 65、A和F）对肉鸡组织颜色测量的影响。两块胸浅肌前部的颜色值彼此无差异，因此可将其中一块用作另一块的对照。光线穿透较薄的肌肉后部并被白色背景反射，与较厚的肌肉前部相比，产生了不同的L*、a和b值。这些变化可能会改变或掩盖组织中的颜色变化。光线穿透0.5厘米厚的切片鸡胸肉、绞碎的鸡胸肉和绞碎的鸡腿肉样品，并被背景大量反射，当比较样品厚度和背景颜色时，会导致颜色差异（P < 0.05）。白色和粉色背景反射的光量最大，其次按降序排列为绿色和灰色。随着样品厚度从0.5厘米增加到1.0厘米，背景反射的光量减少，在1.5厘米厚的样品中未出现因反射导致的差异。背景反射会妨碍对样品真实颜色的测量。根据每种光源的主要波长特性，三种光源产生了不同的（P < 0.05）颜色值。光源的选择应取决于光源的波长特性、样品颜色以及要测量的颜色值。
