Toshiba e-studio 202L, Service Manual, Page: 188 / 354

e-STUDIO200L/202L/230/232/280/282 IMAGE PROCESSING June 2004 © TOSHIBA TEC
7 - 4
7.3 SLG Board
7.3.1 Features
1) The image processing section on the SLG board is controlled by the CPU on the SLG board.
2) The image processing section on the SLG board realizes the following when functioning the equip-
ment:
-
High quality image processing
- Image memory editing
- Editing processing
- Gamma correction
- Gradation processing
- External output system interface
7.3.2 Functions of image processing circuit
The image processing section mounted on the SLG board realizes the followings:
1) High quality image processing
- Background processing function (Range correction)
This function removes undesirable background so that the original can be reproduced appropri-
ately. By using the background adjustment function while manually adjusting the image density,
undesirable background of the original can be removed if any, and some necessary but disap-
peared background can be recovered. By using this function, it is possible to cut the background
density down to zero when copying originals which have a certain level of background density,
such as newspapers.
<Example>
Fig. 7-4
Histogram
Dynamic range
width
Lower Density Higher Lower Density Higher
Text
Back-
ground
After range
adjustment
Extended dynamic range
width
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