东华大学：《颜色科学》课程PPT教学课件（色彩学基础）第2章 色度学原理与CIE标准色度学系统

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2 第 2 章 色 度 学 原 理 与 CIE 标 准 色 度 学 系 统

Prologue This is the story of mister chrome who started out to paint his home. The paint ran out when half away through so to the store he quickly flew to buy some more of matching hue, a delicate shade of egg-shell blue But when he tried this latest batch he found it simply didn't match No wonder he was in a fix for of the colors we can mix, the major shades and those between ten million different can be seen

2 Prologue This is the story of Mister Chrome who started out to paint his home. The paint ran out when half away through so to the store he quickly flew to buy some more of matching hue, a delicate shade of egg-shell blue. But when he tried this latest batch, he found it simply didn’t match. No wonder he was in a fix, for of the colors we can mix, the major shades and those between, ten million different can be seen

You foolish man said missis chrome you should have taken from the home a simple of the color done you cant remember every one. Taking care that she had got a sample from the early pot, she went and bought her husband more of better color from the store Before she paid, she checked the shade, and found a perfect match it made. In triumph now she took it home, and gave it straight to Mister Chrome. He put it on without delay, and found the color now okey

2 You foolish man, said Missis Chrome, you should have taken from the home a simple of the color done; you can’t remember every one. Taking care that she had got a sample from the early pot, she went and bought her husband more of better color from the store. Before she paid, she checked the shade, and found a perfect match it made. In triumph now she took it home, and gave it straight to Mister Chrome. He put it on without delay, and found the color now okey

But, after dark, in tungsten light they found the color still not right. So to the store they both went now, with samples clear, and as ked them how a paint that matched in daylight bright could fail to match in tungsten light The man's reply to their complaint was that the pigments in the paint had been exchanged, since they had bought for others of a different sort To solve the problem on their wall, he gave them paint to do it all from just one batch of constant shade and then at last success was made

2 But, after dark, in tungsten light, they found the color still not right. So to the store they both went now, with samples clear, and asked them how a paint that matched in daylight bright could fail to match in tungsten light. The man’s reply to their complaint was that the pigments in the paint had been exchanged, since they had bought, for others of a different sort. To solve the problem on their wall, he gave them paint to do it all from just one batch of constant shade, and then at last success was made

To compensate them for their trouble, the store sent to them curtains double They hung them up with great delight; they matched in tungsten and daylight. A neighbor then did make a call and fixed his eye upon the wall; the paint, he said was all one color, but clearly saw the curtains duller Though colors strange at times appear, the moral of this tale is clear. to understand just what we see, object, light, and eye, all three must color all our thin king through of chromic problems, old or new

2 To compensate them for their trouble, the store sent to them curtains double. They hung them up with great delight; they matched in tungsten and daylight. A neighbor then did make a call and fixed his eye upon the wall; the paint, he said was all one color, but clearly saw the curtains duller! Though colors strange at times appear, the moral of this tale is clear: to understand just what we see, object, light, and eye, all three, must color all our thinking through of chromic problems, old or new!

21色度学实验依据 211颜色匹配实验 颜色转盘 G (a)

2 2.1 色度学实验依据 2.1.1 颜色匹配实验 颜色转盘

颜色光的匹配实验 奸# !挡 AEL 版

2 颜色光的匹配实验

212同颜色光亮度的相加 设有三个不同颜色的色光:P、Q、R 相应色的单位量值:P]、[Q]、R p、q、r分别为颜色P*、Q*、R*的强度。 调出[P/L、IQ/L、[R]/L,使这些光 亮度相等。L、L、L即为单位颜色P]、|Ql R的光亮度比值。 选择光亮度单位,则LpL、L为P Q]、[R各单位颜色的光亮度值 因此,L、L、L是单位颜色Pl、|Ql、R 的光亮度系数

2 2.1.2 同颜色光亮度的相加 设有三个不同颜色的色光 ：P*、Q*、R* 相应色的单位量值：[P]、[Q]、[R] p、q、r分别为颜色P*、Q*、R*的强度。 调出[P]/ Lp、[Q] / Lq、[R] / Lr，使这些光 亮度相等。Lp、Lq、Lr即为单位颜色[P]、[Q]、 [R]的光亮度比值。 选择光亮度单位，则Lp、Lq、Lr为[P]、 [Q]、[R]各单位颜色的光亮度值。 因此，Lp、Lq、Lr是单位颜色[P]、[Q]、[R] 的光亮度系数

212同颜色光亮度的相加 pP]、qIQ两色混合,与rR光亮度比较 实验证明: 当p、q、r满足下列数值关系时,被比较 的两光亮度相等。 pLp+aLar (2-1) 物理意义: 不论颜色的成分如何,各种颜色重叠的光 亮度是可以相加的

2 2.1.2 同颜色光亮度的相加 p [P]、q [Q]两色混合，与 r [R]光亮度比较 实验证明： 当 p、q、r 满足下列数值关系时，被比较 的两光亮度相等。 p Lp + q Lq = r Lr （2-1） 物理意义： 不论颜色的成分如何，各种颜色重叠的光 亮度是可以相加的

22颜色的数学表示 221色三角形 色度匹配:色光相同的颜色和亮度 色度:色光的颜色和亮度的统称 G 色坐标: (r,g。b) B R

2 2.2 颜色的数学表示 2.2.1 色三角形 色度匹配：色光相同的颜色和亮度 色度：色光的颜色和亮度的统称 B* G* R* r b g B* G* R* r b g 色坐标 ： （r，g。b）