Mitsubishi P91DW User Manual download pdf (Page 35)

Alpha Innotech User’s Manual, version 4

2-4

Black Level set at 0 Black Level set at 60

White Level Adjustment

The number beneath the White Level scale also corresponds to a gray scale value. When

the slider is at the very bottom of the scale, this number is 255. As the slider is moved

upwards along the scale, the number decreases and the image becomes progressively

lighter. This is because all pixels at the specified gray level value and above are shown on

the screen as white pixels. For example, if the slider is set to 150, all the pixels between

150 and 255 are shown as white and the image appears lighter.

White Level set at 255 White Level set at 150

Gamma Setting Adjustment

Changing the Gamma setting affects the image brightness by adjusting the linearity of

the image on the screen and printouts, but does not affect quantitative data.

The camera sees objects linearly while the human eye does not. When the Gamma

setting is set to a value of 1, the image is displayed as the camera sees it. This, however,

is different from what the human eye detects. By adjusting the Gamma setting, the user

can make the image on the screen correspond to what is seen when he/she looks directly

at the object. We recommend a Gamma setting of 0.55 for best visual representation.

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Mitsubishi P91DW User Manual Page 35