Canon Vizcam 1000, Service Manual

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3. OPERATION AND TIMING
COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
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o. Output masking
A color image is reproduced by color toners with Y toner absorbing the B component, with M toner
absorbing the G component, and with C toner absorbing the R component.
However, in practice, the toners do not have pure color absorption characteristics as shown in Figure 3-
336. In general, Y toner tends to have good absorption characteristics, but M toner tends to have undesirable
absorption characteristics for the B component; and C toner likewise tends to have undesirable absorption
characteristics for the G and the B components (segments enclosed in Figure 3-336). In other words, M toner
if left as it is would tend to have color reproduction characteristics that include the Y component, and C toner
would have color reproduction characteristics that include the M and the Y components.
Figure 3-336
For this reason, reproduction of red by mixing Y toner and M toner would produce a yellowish red
because of the Y component of M toner. Real red could be reproduced by removing the Y component from M
toner (masking) in advance. This block makes such correction by masking the excess component in each
toner.
500 400 600 700
100%
B
G
R
Y
C
M