GSO ASTM D2244:2013由GSO 发布于 2013-09-09。
GSO ASTM D2244:2013在国际标准分类中归属于: 17.180.20 颜色和光的测量。
GSO ASTM D2244:2013 计算颜色变化和仪器测量比色坐标差异的标准实施规程的最新版本是哪一版?
最新版本是 GSO ASTM D2244:2013 。
1.1 This practice covers the calculation, from instrumentally measured color coordinates based on daylight illumination, of color tolerances and small color differences between opaque specimens such as painted panels, plastic plaques, or textile swatches. Where it is suspected that the specimens may be metameric, that is, possess different spectral curves though visually alike in color, Practice D4086 should be used to verify instrumental results. The tolerances and differences determined by these procedures are expressed in terms of approximately uniform visual color perception in CIE 1976 CIELAB opponent-color space (1),2 CMC tolerance units (2), CIE94 tolerance units (3), the DIN99 color difference formula given in DIN 6176 (4), or the new CIEDE2000 color difference units (5). 1.2 For product specification, the purchaser and the seller shall agree upon the permissible color tolerance between test specimen and reference and the procedure for calculating the color tolerance. Each material and condition of use may require specific color tolerances because other appearance factors, (for example, specimen proximity, gloss, and texture), may affect the correlation between the magnitude of a measured color difference and its commercial acceptability. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory requirements prior to use.
这种测量方式更为灵活,是指定测量颜色差异的方法。 X Y Z 三刺激值(x y Y值)X Y Z 三刺激值由x+y+z = 1 x = X/(X + Y + Z) y = Y/(X + Y + Z) z = Z/(X + Y + Z)计算得到,x和y的值能在x y坐标中精确的测量物体颜色,由色度空间决定。CIE L*a*b*色标运行中a轴从绿色变为红色时,b轴由黄色到蓝色,L轴从黑色到白色运行....
标准中强调了计算方法和偏差。S=α+β/(log△E*ab-τ),而仪器要提供α、β、τ系数的可修订功能。 这是仪器差异的地方。另外,色度可以反应产品的品质,但不是最关键的指标,通常测量准确会对快速判断有很好的指导作用。 ...
特点:光电积分式仪器能准确测出两个色源之间的色差,但不能测出色源的三刺激值和色品坐标。2.2分光光度法 通过测量光源的光谱功率分布或物体反射光的光谱功率,根据这些光谱测量数据通过计算的方法求得物体在各种标准光源和标准照明体下的三刺激值,进而由此计算出各种颜色参数。特点:分光光度测色仪不仅能测量色差,还能测量色源的三刺激值和色品坐标,应用非常广泛。...
由于比色计是目视仪器,由不同的观察者用同一台比色计测量同一样品,会得出不同的测量值,有时相差会很大。这是因为不同观察者的视觉特性有一定的差异,也就是由不同的观察者对颜色的分辨力不同造成的。 如何减小人为的测量误差呢?正确的测量方法是:找3个色觉正常的人,在同一环境、使用同一台比色计、背对背测量同一样品,取3个测量值的平均值作为测量结果。 ...
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