如果显示器没有图像显示，首先确保正确设置亮度和对比度的调节进行正确的设置。
If there is no image on display monitor, first ensure that the adjustment for brightness and contrast are properly set.
有一些旋钮在上面，用来调节显示器亮度，对比度，颜色以及屏幕大小和位置等。
On the monitor, there are some knobs which are used to adjust its lightness, contrast, color and the screen's size and location, etc.
可以通过对拍摄物的散射光调节获取正确的对比度。
Correct contrast can be achieved by directing diffused lighting onto the subject.
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