CRT颜色再现中的“黑点”对CRT色度特性的影响

The Influence of Black Point on Colorimetric Characterizations When Producing Desired Colors on CRT Monitors

计算机控制的ＣＲＴ彩色监视器能产生丰富多彩的灵活可控的颜色，在众多领域中得到了广泛应用。标定一台彩色监视器，利用ＣＲＴ进行颜色再现，首要任务就是评价ＣＲＴ的色度特性。一般认为，ＣＲＴ色度特性中的色品坐标恒定性、枪的独立性性能在低亮度时均较差。由于测量过程中测量仪器信噪比的限制，上述结论并不具有权威性。我们利用高精度的ＰＲＩＴＣＨＡＲＴＭＯＤＥＬ１９８０Ｂ光谱辐射计，对ＳＯＮＹ公司的ＰＶＭ－１４４２ＱＭ彩色监视器进行了大量色度测试，并在测量过程中对ＰＲ－１９８０Ｂ光谱辐射计的测量条件进行了选择，以提高信噪比。在此基础上，我们引入了“黑点”的概念，依靠大量的实验数据，提出了低信号电平时，色品坐标恒定性、枪的独立性仍成立的观点。

Computer controlled CRT monitors can produce plenty of changable controlled colors, and was widely used in many fields. The first and the most important thing we should do when calibrating a color monitor to achieve CRT color reproduction is to evaluate CRT colorimetric characterizations. Many people believed that some colorimetric characterizations such as phosphor constancy and gun independence were reduced at low signal levels. Because of difficulties in signal to noise limitations in their measurements, their results were not definitive. In the paper we presented quantitites of measurements for a SONY PVM 1442QM monitor by a PRITCHART MODEL 1980B Spectral Radiometer, which was highly precise and was selected on measure conditions in order to improve signal to noise ratio. On the basis of those measurement results, we introduced the concept of black point and advanced our point that phosphor constancy and gun independence were comparably well at low signal levels after erasing the influence of black point.