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楼主 |
发表于 2016-11-5 17:25 · 北京
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saoni 发表于 2016-11-5 17:17 
就这么几句话...而且还说的是投影机...
外媒对一切显示设备的对比度测试，绝大部分都是用ANSI对比度测量法
请下次用WIKIPEDIA和GOOGLE
Static contrast ratio is the luminosity ratio comparing the brightest and darkest color the system is capable of producing simultaneously at any instant of time, while dynamic contrast ratio is the luminosity ratio comparing the brightest and darkest color the system is capable of producing over time (while the picture is moving). Moving from a system that displays a static motionless image to a system that displays a dynamic, changing picture slightly complicates the definition of the contrast ratio, due to the need to take into account the extra temporal dimension to the measuring process.
Methods of measurement[edit]
Many display devices favor the use of the full on/full off method of measurement, as it cancels out the effect of the room and results in an ideal ratio. Equal proportions of light reflect from the display to the room and back in both "black" and "white" measurements, as long as the room stays the same. This will inflate the light levels of both measurements proportionally, leaving the black to white luminance ratio unaffected.
Some manufacturers have gone as far as using different device parameters for the three tests, even further inflating the calculated contrast ratio. With DLP projectors, one method to do this is to enable the clear sector of the color filter wheel for the "on" part and disable it for the "off" part[2] This practice is rather dubious, as it will be impossible to reproduce such contrast ratios with any useful image content.
Another measure is the ANSI contrast, in which the measurement is done with a checker board patterned test image where the black and white luminosity values are measured simultaneously.[3] This is a more realistic measure of system capability, but includes the potential of including the effects of the room into the measurement, if the test is not performed in a room that is close to ideal.
It is useful to note that the full on/full off method effectively measures the dynamic contrast ratio of a display, while the ANSI contrast measures the static contrast ratio
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楼主: a9vgsux
川公网安备 51019002005286号
发表于 2016-11-5 16:52 · 广东
，那我得再t两脚了，hdr完全不懂的键盘瞎
表示只喜欢蓝天
