(57) Disclosed is a system of image data conversion, capable of setting conversion characteristics
with more ease even for data having mixed image attributes such as graphics including
characters, drawings, photographs, and of reducing the amount of data to be prepared
for, eg, gamma conversion and the size of memory required. The conversion system includes
processing elements (PE1,PE2,PE3) in a processor array, each including at least an
input data register (RO), character registers (R1,R2,R3), an attribute register (R4,RM),
and a global processor (148), so that a calculator (MUX,ALU,T) in each of the processing
elements operates to select, and store in the character registers, the data set, xi, yi, and ai, corresponding to attribute data stored in the attribute register, to be conversion
processed subsequently according to an expression stored in the global processor.
The global processor assumes overall control such as writing raster image data x into
each processing element, corresponding to each attribute data from a data memory (146)
to character registers, imparting an operation instruction set to each calculator
for performing the data conversion, and outputting conversion processed data yi written into an output register (R5).
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