Ricoh VT3500, Service Manual

Page: 150 / 330

The compensation ratio varies according to which image density and contrast
are selected. For example when Darker 1 key is selected the output value of
the image data is increased slightly (i.e. it is slightly higher than the output
obtained when Normal density is selected).
When Light Tone key is selected, the 8-bit output concentrates on the light
tone part of the image (the low input value). This helps better reproduce the
lighter parts of the image and the whole image will darken a bit. On the other
hand, when Darker Tone key is selected, the 8-bit output concentrates on the
dark tone parts of the image. This helps better reproduce the darker parts of
the image and the whole image will lighten a bit.
The above graphs show the compensation ratios for each contrast and image
density setting.
[Normal]
Output
0
255
0 63 Input
A
B
C
D
[Light Tone]
Normal
Output
0
255
0 63 Input
A
B
C
D
Tone
A: Darker 2
B: Darker 1
C: Normal
D: Lighter
[Dark Tone]
Output
0
255
0 63 Input
A
B
C
D
Normal
Tone
1 December 1993
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