Olivetti d-Color MF550 Theory Of Operation page 176

Theory of Operation Ver. 8.0 Jun. 2008
20. When copying in a photo mode or making PC print, the R, G, and B data is con-
verted to the Y, M, C, and K density data. Also, the masking processing, which
compensates for the deviation in the spectral reflection characteristics of the toner,
and UCR/BP processing are performed on the image data.
For PS printing, multi-valued data of Y, M, C, and K are stored and there is no need
of converting or processing those data.
21. Edge of letter and lineal drawing gets area discrimination and FEET processing is
conducted according to the discrimination result.
22. When FEET processing is conducted, interpolation is done so that no influence is
given to continuous gradation portion.
23. Multi-valued data (photo mode) gets gamma correction at this time. Makes the nec-
essary corrections so that the printed gradations have linear characteristics, since
the image density of the input image data is not directly proportional to that of the
printed image because of the changing developing and PC drum characteristics.
24. Creates the density distribution of a predetermined pattern to enable outstanding
gradation reproduction.
25. Image data of the file memory is developed to the frame memory and output delay
control for the interval of PC drums, Y, M, C, K is conducted.
26. Correct the shear in printing start position in the main scanning direction, which
occurs when each PH unit of Y, M, C, K is exposed on the PC drum. Adjust the pro-
cessing speed in the board (main scanning) to conform to the input processing
speed. The laser is emitted according to the laser intensity information.
Y107522-3 Theory of Operation
23. Image processing
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