Konica Minolta IV - Manual (Page 65)

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The input shadow slider sets the black level. As the slider is moved to the right, an
apparent increase in contrast can be seen in the displayed image. All pixels to the left
of the slider are set to 0 and any image detail they may contain will be lost.
The black and white output levels can be adjusted. By moving the output highlight and
shadow sliders, the contrast of the image can be reduced.
The auto-setting function automatically adjusts the
tone curve and histogram to maximize image
contrast and color. The darkest pixels in the image
are set to a black level of 0, the brightest pixels are
set to a white level of 255, and the rest of the pixels
are distributed between them equally.
Click the auto-setting button. The change is
immediately reflected in the displayed image. To
view the change in the histogram, press the apply
button. Click the reset button to cancel the auto
setting.
Click the color-histogram button
to view the red, green, and blue
histograms.
Click the histogram RGB display
button again to close the color
histogram display.
Tone curve / histogram auto setting