| 摘要 |
n-bit code numbers in a picture store 11 are read out synchronously with television waveforms to a "palette" 17 (programmable look-up table) and digital-to-analogue converters 18R, G, B to provide video signals for a picture whose elements are individually given their colours by the stored n-bit numbers. A keyboard 22, graphics tablet 24 and control unit 20 enable an artist to set up the contents of the store 11 to draw the desired picture. In order to allow a modification to the picture to be tested, a flag bit store 12 can have flag bits set to "1" for those elements which are to be in a new colour defined by an n-bit code written into a register 26. When a signal on input 34 is "1" each "1" flag bit causes a selector 16 to pass the register code to pass to the palette 17 in place of the corresponding code in the picture store 11. When the artist is satisfied with the modification, the unit 20 writes the code in the register 26 into all n-bit locations in the store 11 corresponding to "1" flag bits, which are reset to "0". <IMAGE>
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