Ricoh C211 Service Manual page 44

1.6 Enlargement Processing: VT2300/VT2500
In reduction processing, pixels are discarded according to the selected
reduction ratio, In enlargement processing, pixels are added.
Enlargement processing requires main scanning enlargement and
sub-scanning enlargement.
Main Scanning : Main scanning is performed by systematically
adding pixels according to the enlargement ratio.
Sub-Scanning :
Sub-scanning is petformed by changing the original
transportation speed according to the enlargement ratio.
1.6.1 Main Scanning Enlargement
When the magnification command is sent from the main mntrol board (CN402-
19, 20, 21), the timing signal generator in the image processing board sends
the adding timing oontrol signal. Pixels are added to the 4-bit image data from
the A/D converter according to the adding timing control signal.
Enlarae Mode
Added Pixels Pixel Ratio
1
k
115?40
LT A4 Version 1(/)12 Pixelsl) ~ 15/1 3 Pixels (1.154
122!X0(A4 Version)
3 Pixels 17/1 4 Pixels (1 .214)
1
I
1127'%0 LT Version ( ) I 3 Pixels I ) ~
14/1 1 Pixels (1 .273
141
?40
LT A4 Version
~xels I
elsm
2-10