首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
As one works with color in a practical or experimental way, one is impressed by two apparently unrelated facts. Color as seen is
As one works with color in a practical or experimental way, one is impressed by two apparently unrelated facts. Color as seen is
admin
2010-02-21
107
问题
As one works with color in a practical or experimental way, one is impressed by two apparently unrelated facts. Color as seen is a mobile changeable thing depending to a large extent on the relationship of the color to other colors seen simultaneously. It is not fixed in its relation to the direct stimulus which creates it. On the other hand, the properties of surfaces that give rise to color do not seem to change greatly under a wide variety of illumination colors, usually (but not always) looking much the same in artificial light as in daylight. Both of these effects seem to be due in large part to the mechanism of color adaptation mentioned earlier.
When the eye is fixed on a colored area, there is an immediate readjustment of the sensitivity of the eye to color in and around the area viewed. This readjustment does not immediately affect the color seen but usually does affect the next area to which the gaze is shifted. The longer the time of viewing, the higher the intensity, and the larger the area, the greater the effect will be in terms of its persistence in the succeeding viewing situation. As indicated by the work of Wright and Shouted, it appears that, at least for a first approximation, full adaptation takes place over a very brief time if the adapting source is moderately bright and the eye has been in relative darkness just previously. As the stimulus is allowed to act, however, the effect becomes more persistent in the sense that it takes the eye longer to regain its sensitivity to lower intensities. The net result is that, if the eye is so exposed and then the gaze is transferred to an area of lower intensity, the loss of sensitivity produced by the first area will still be present and appear as an "afterimage" superimposed on the second. The effect not only is present over the actual area causing the "local adaptation" but also spreads with decreasing strength to adjoining areas of the eye to produce "lateral adaptation." Also, because of the persistence of the effect if the eye is shifted around from one object to another, all of which are at similar brightness or have similar colors, the adaptation will tend to become uniform over the whole eye.
The present selection has apparently been preceded by some explanation of ______.
选项
A、some experiments with color pigments
B、the nature of color
C、the color properties of various surfaces
D、the mechanism of the eye’s adaptation to color
答案
D
解析
眼睛的颜色适应能力。A色素试验;B颜色属性;C不同的表面色彩均不符文意。
转载请注明原文地址:https://kaotiyun.com/show/P0IO777K
0
考博英语
相关试题推荐
Whichproductshavesoldbest?Whichproductdoesthemanstillneed?
Howmanyaretherequalitycontrolinspectionpoints?Howtocheckthequalityduringproduction?
Howmuchshouldthemanpay?
Lookatthenotesbelow.Someinformationismissing.Youwillhearadialogueontheseriousconditionofacompany.Foreachq
•MsJadeZhang,ManufacturingManagerofyourplant,usuallytakeschargeofallaffairsincludingsigningdocumentswhenyou
ComputersalesfellduringAprilbutroseagaininMaytoexceedtheMarchsales.
Thenumberofvehiclesleasedremainedlowthroughouttheyear,risingonlybrieflyabovesales,whichfluctuateddramaticallyi
Ourhighlytrainedunemploymentinsurancespecialistsareavailable9:00-20:00MondaytoFriday&10:00-18:00Saturday.Onlineq
观察和评价一个国家的人权状况,应考虑到该国的历史、社会、经济、文化等条件,不能割断该国的历史、脱离该国的国情,更不能按一个模式或某个国家或区域的情况来简单套用。各国的人权问题主要由各国政府和人民自己来解决,世界的人权问题要由世界各国政府和人民共同参与来解决
(Cigarettesmoke)hasbeenshowntocontainnumerouscompoundsthat(areknownto)causecancerinexperimentalanimalsand(the
随机试题
1~3个月婴幼儿会笑出声,此时他的发音也会增多,能清晰的发出一些()
某空调的温度设定为25℃,当室温超过25℃后,它便开始制冷,此时红色指示灯亮,并在显示屏上显示“正在制冷”字样,那么:
A公司是于1997年3月上市的股份有限公司,其主营业务是各种照明产品的生产与销售,凭着掌握的新型感光材料技术,上市时大获成功,前景看好。但好景不长,随着市场竞争加剧、技术普及、管理手段落后,2002年、2003年连续两年亏损,被中国证监会“ST”处理。20
旧民主主义革命时期思想家经亨颐提倡“人格教育”,鼓吹()的思想。
在火情发生时,如果学生的衣服已经着火,教师首先应采取的措施是()。
你是新进的国税公务员,现你单位要在中小学生中间开展税法宣传活动,活动需要和学生所学知识相结合同时还要有趣昧性,如果活动由你来组织,请问你如何组织?(2012年2月29日国家公务员面试真题)
[2007年10月]点P0(2,3)关于直线x+y=0的对称点是()。
资本主义工资()
A、Yes,itis.B、Yes,I’dloveto.C、It’sverybig.A
ItispossibleforstudentstoobtainadvanceddegreesinEnglishwhileknowinglittleornothingabouttraditionalscholarlyme
最新回复
(
0
)