IPT色空间在色域映射和图像色貌模型研究中得到应用。介绍了IPT色空间,采用D65光源下的孟塞尔系统和Ebner和Fairchild提出恒常色相数据研究了IPT色空间的均匀性。孟塞尔系统的三刺激值XYZ作为IPT色空间输入值,计算明度、彩度和色相,并与CIELAB色空间计算结果进行均匀性比较。结果表明,在明度均匀性方面,两个色空间结果基本相似,CIELAB色空间比IPT色空间稍好;在彩度均匀性上,CIELAB色空间较好于IPT色空间;在色相均匀上,采用孟塞尔系统数据的计算结果中IPT色空间在对蓝色色相预测和各个色相角的线性关系要比CIELAB色空间好,而对于Ebner和Fairchild恒常感知色相数据,IPT色空间的色相均匀性明显优于CIELAB色空间。

The IPT color space has been used in the study of gamut mapping and image color appearance model. The uniformity of IPT was investigated using Munsell system and Ebner and Fairchild′s constant hue data sets,and compared with calculated ones of CIELAB color space. Tristimulus value X,Y and Z of Munsell data set with an illuminant of D65 were used as input of IPT and CIELAB to compute lightness,chroma,and hue. The calculated results showed that:IPT and CIELAB models have similar performance in lightness uniformity;CIELAB has better performance than IPT in chroma uniformity;on hue uniformity,the IPT is only better in blue area and has better linear relation in every hue angle than CIELAB with Munsell data set,however,the IPT is better than CIELAB with Ebner and Fairchild′s constant hue data sets.