To make more effectively executable the color correction for picture data by using a look-up table.

The colors of read picture data are corrected by a display look-up table 112 and the color-corrected data are displayed on a display. The table 112 regulates the value of output picture data of each of plural regulated points set up in a three-dimensional coordinate system setting up the values of input picture data as coordinate values, the value of output picture data corresponding to the value of optional input picture data is obtained by interpolating operation, the value of output picture data of a regulated point corresponding to the maximum value of the input picture data is set up to a value larger than '255' which is a programmed maximum value and the programmed maximum value is acquired also for an input picture data value smaller than the maximum value, so that a clearer color image of high luminance can be obtained. A look-up table for recording read picture data sets up the value of output picture data corresponding to the minimum value of input picture data to a value smaller than a prescribed minimum value.