显示深度、图像深度是图像显示的重要指标。当（ ）时，显示器不能完全反映数字图像使用的全部颜色。
- A.显示深度=图像深度
- B.显示深度＞图像深度
- C.显示深度＞=图像深度
- D.显示深度＜图像深度
正确答案及解析
正确答案
解析
图像深度图像文件中记录一个像素点所需要的位数，显示深度表示显示缓存中记录屏幕上一个点的位数，也即显示器可以显示的颜色数。因此，显示一幅图像时，屏幕上呈现的颜色效果与图文提供的颜色信息有关，也即与图像深度有关，同时也与显示器当前可容纳的颜色容量有关，也即与显示深度有关。
①显示深度大于图像深度：在这种情况下屏幕上的颜色能较真实地反映图像文件的颜色效果。显示的颜色完全取决于图像的颜色。
②显示深度等于图像深度：这种情况下如果用真彩色显示模式来显示真彩色图像，或者显示调色板与图像调色板一致时，屏幕上的颜色能较真实地反映图像文件的颜色效果；反之，显示调色板与图像调色板不一致时，显示色彩会出现失真。
③显示深度小于图像深度：此时显示的颜色会出现失真。
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