Canon 1000 Service Manual page 93

h. Color Space Correction
The range of possible color reproduction is wider with photo originals and computer-generated originals
than with color printers.
In the conventional method shown in Figure 3-323, colors (point a, point b) falling within the printer's
color reproduction range are reproduced faithfully; however, a color (point c) outside the range is not
reproduced properly, resulting in a discrepancy in gradation between original and output images.
The CLC1000 has a good understanding of the color space (hue, brightness, vividness) that can be
reproduced by the printer. It checks the RGB data read by pre-scanning and processes it so that it can fit the
printer's color reproduction range. With this arrangement, the CLC1000 reproduces the gradation of originals
much more faithfully than copiers using the conventional method.
c
• Conventional method
b
a
c
• CLC1000
b
a
COPYRIGHT © 2001 CANON INC.
Color reproduction range
in photo original
of printer
Color reproduction range
in photo original
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
Color reproduction range
in photo original
Color reproduction range
of printer
Color space (hue, vividness, brightness)
on copy
b,c
a
Color reproduction range
of printer
Color space (hue, vividness, brightness)
on copy
c
b
a
Color reproduction range
Figure 3-323
3. OPERATION AND TIMING
Ideal value
bc
b
a
Color space (hue, vividness, brightness)
of original
Ideal value
b
b
a
Color space (hue, vividness, brightness)
of original
c
Output value
c
c
Output value
3-49