FrameMaker Ver5.5E(PC) CF1501/CF2001 MECHANICAL/ELECTRICAL
00.12.15
M-21
6. Histogram Making
• The scanning area is divided into multiple blocks.
• The image data of the original (excluding the edges) is sampled during the prescan after
the shading correction.
• A histogram is then generated of lightness by saturation.
• The number of color dots in each block is counted.
• The results of the counting are then used to determine whether each block on the original
(excluding the edges) is colored or monochrome.
• Based on the results of the color/monochrome evaluation made of each block, the copier
determines whether the entire original is colored or monochrome (ACS, or Auto Color
Selection).
7. Image Data Editing
• R, G, and B data are converted to V (value), Cr, and Cb (color component) for color
adjustments (saturation, lightness, and hue).
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Block Division
Edge
Edge
Edge
Edge
Original
CD
FD
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Histogram
Frequency
Monochrome
CD
Saturation
Colored
Low
High
Frequency
Colored
Monochrome
Lightness
Dark
Light
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