HP 8550 Service Manual - Page 223
Output masking, therefore, the Y component of the M toner would cause the result
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Output masking A color image is reproduced using color toners since the Y toner absorbs only B components, the M toner absorbs only the G component, and the C toner absorbs only the R component. In reality, however, no toner possesses chromatic absorption characteristics as depicted in figure 113. In general, Y toner possesses good absorption characteristics: however, M toner is affected by B components, while C toner is affected by G and B components (see circled areas). In other words, M toner has a chromatic reproduction quality that includes Y components, while C toner has a chromatic reproduction quality that includes M and Y components. Figure 113. Chromatic absorption characteristics If Y and M toners were mixed in an attempt to reproduce red, therefore, the Y component of the M toner would cause the result to have a reddish tinge, requiring removal (masking) of the Y component from the Y toner in advance. In this block, the excess component of each toner is corrected by means of masking. EN Copy module 221