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
2013-11-29
88
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 Schouten, 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.
This selection is concerned primarily with ______.
选项
A、the adaptation of the eye to color
B、the color of colors
C、the properties of colored surfaces
D、the effect of changes in color intensity
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/kChO777K
0
考博英语
相关试题推荐
Therearefourbasictypesofcompetitioninbusinessthatformacontinuumfrompurecompetitionthroughmonopolisticcompetiti
BeforetheIndustrialRevolution,therecouldhavebeenfewfamilyreunionsasweknowthisceremonyatthepresenttime,withi
Cultureisactivityofthought,andreceptivenesstobeautyandhumanefeeling,【1】ofinformationhavenothingtodowithit.Am
Thereisacloserrelationshipbetweenmoralsandarchitectureandinteriordecoration【C1】______wesuspect.Huxleyhaspointedo
CoachGreenallowedJohntojointhebasketballteamalthough,______,hewasnottallenough.
ThebeginningofwhatwastobecometheUnitedStateswascharacterizedbyinconsistenciesinthevaluesandbehaviorofitspop
In1885OwenWister(1850~1938)recordedthat"itwon’tbeacenturybeforetheWestissimplythetrueAmerica,withthought,t
In1885OwenWister(1850~1938)recordedthat"itwon’tbeacenturybeforetheWestissimplythetrueAmerica,withthought,t
(81)TheagreementisoverseenbytheCommitteeonAgriculturewhichreviewsprogressintheimplementationofcommitments,and
Thenewspapermustprovideforthereaderthefacts,unalloyed,unsalted,objectivelyselectedfacts.Butinthesedaysofcomp
随机试题
A、Hebelievesthecostistoomuch.B、Hethinkstheheadmasterhasnoenoughmoneytoruntheschool.C、Hethinksthetuitionis
A.Tennison法B.Langenbeck法C.Furlow法D.Millard法E.BrianSommerlad法唇高恢复好,但容易出现患侧唇过长现象的单侧唇裂修复法是
采用现金交割方式的是()期货。
销售商品采用以旧换新方式的,销售的商品应当按照销售商品收入确认条件确认收入,回收的商品作为购进商品处理。()
甲公司持有乙公司30%有表决权股份,能够对乙公司施加重大影响,对该股权投资采用权益法核算。2017年10月,甲公司将该项投资中的50%出售给非关联方,取得价款900万元,相关手续于当日完成。处置股权后甲公司无法再对乙公司施加重大影响,将剩余股权投资转为可供
下列权益乘数表述不正确的是()。
教师在组织教学过程中要让学生注意什么,感受什么,联想什么,以及表达什么,关键在于教师怎样利用教学语言进行引导。教学语言包括()。
关于ElGamal算法的描述中,错误的是()。
单击“字处理”按钮,然后按照题目要求完成下面的操作。注意:以下的文件必须保存在考生文件夹下。北京计算机大学组织专家对《学生成绩管理系统》的需求方案进行评审,为使参会人员对会议流程和内容有一个清晰的了解,需要会议会务组提前制作一份有关评审
A、Heisalwayspunctualforhisclass.B、Herarelynoticeswhichstudentsarelate.C、Hewantshisstudentstobeontimeforcl
最新回复
(
0
)