Gestetner G060, Service Manual

Page: 454 / 1106

IMAGE ADJUSTMENT
G570 3-6 SM
Adjustment Reference For Gamma Correction
The following tables show the adjustment reference for gamma correction in the
photo mode. The tables show the level of the color scale on the C4 test chart and
on the tone control test sheet printed in the printer SP mode.
For example, for K at 1200 x 1200 dpi, grade 12 on the tone control test sheet
should be the same as grade 8 on the C4 chart.
Normally, it is not necessary to adjust the gamma data as shown in the table since
ACC adjusts the gamma curve automatically. The fine-tuning of color balance by
gamma data adjustment will be required only when the result from ACC and Color
Calibration does not meet the customer’s requirements.
C4 test chart 1 2 3 4 5 6 7 8 9 10
600 x 600 – 1 3 5 6 9 10 11 16 –
1200 x 600 – 1 3 5 6 8 10 11 16 –
K
Test
sheet
1200 x 1200 – 1 3 4 6 8 10 12 15 16
C4 test chart 1 2 3 4 5 6 7 8 9 10
600 x 600 – 1 3 5 6 9 10 12 13 14
1200 x 600 – 1 3 5 6 8 10 11 12 13
C
Test
sheet
1200 x 1200 – 1 3 4 5 8 10 11 12 13
C4 test chart 1 2 3 4 5 6 7 8 9 10
600 x 600 – 1 4 6 8 11 12 14 16 –
1200 x 600 – 1 4 6 8 11 12 15 16 –
M
Test
sheet
1200 x 1200 – 1 4 6 7 10 12 14 16 –
C4 test chart 1 2 3 4 5 6 7 8 9 10
600 x 600 1 3 4 9 11 12 14 15 16 –
1200 x 600 1 3 5 8 10 11 14 15 16 –
Y
Test
sheet
1200 x 1200 1 3 5 8 10 11 14 15 16 –