RICOH GROUP COMPANIES
CONTROL NO. 296
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SUBJECT: IPU BOARD ROM
GENERAL:
The IPU Board ROM has been modified. The following is a description of the changes to the ROM.
The Dither Processing method for Printer Mode has been modified to improve jagged image (the outline of
characters is not straight) and reproduction of fine straight lines in the sub scan direction.
Current Dither Processing in Printer Mode
In Printer Mode, 2 x 1 dot Dither Processing is always used. This Dither Processing was originally designed
to attach more importance to gradation than resolution. It evaluates the video signal level of the two pixels
next to each other and converts the data as follows:
Original Data Printed Data
Video data in the left pixel Any Doubled data is printed
Video data in the right pixel
Data ≤ 128
No data is printed
Data > 128 (Data – 128) x 2 is printed
NOTE:
Maximum printed data is 255.
With the current Dither Processing method, it is possible that the data in the right pixels are lost, resulting in
a jagged image or fine lines in the sub scan direction are not reproduced.
New Dither Processing in Printer Mode
With the new IPU ROM, Dither Processing in Printer Mode has been changed as follows:
Original Data Printed Data
Video data in the left pixel
Data ≤ 32
Doubled data is printed
Data > 32
Original data + 32
Video data in the right pixel
Data ≤ 32
No data is printed
Data > 32 Original data –32 is printed
NOTE:
Maximum printed data is 255.
Continued…
Note:
This copy is intended as a master original
for reproduction of additional bulletins.
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