Image processing systems and data input devices therefor

An image processing system comprising:

• a data input device for generating input data;
• an image processing device for performing a predetermined image processing operation on the data inputted by said data input device;
• and
• a display device for displaying the result of the image processing operation performed by said image processing device;
• wherein said data input device comprises a plurality of input instruments each including input means, and a structure to detect information on a position where said input means is manipulated to thereby increase a quantity of information to be detected,
• wherein said input means in each of said input instruments includes means for generating a frequency inherent thereto and means for changing said frequency depending on a writing pressure applied to said input means,
• wherein said means for changing frequency switches said frequency from one value to another at a predetermined point of said writing pressure,
• wherein said data input device comprises a panel responsive to a touch of said input means to said panel for detecting information on a position of the touch and for selecting color information corresponding to the frequency, and
• wherein said image processor performs an image process on the basis of the selected color information.