JPH0423259B

In the method for improving the drawing in colour image reproduction by partial electronic retouching, the trichromatic sampling of a colour component of the colour image provides the trichromatic components which are subjected to an analog/digital conversion and stored in the memory (1). With a coordinate probe (50, 51, 52), a retoucher will proceed in the same way as with a retouching brush. By means of the probe, the coordinates of a moving area on the image (surface of the brush) of a trichromatic component to be retouched as well as the number of correction steps by image point will be searched. For the marked correction area the corrections will be calculated point by point. The trichromatic components of the coloured image or of a coloured printing will be read in the memory (1) and modified to obtain the retouching effect under the control of a monitor (2). The individual values of the corrections for each correction step may be freely selected. By previously determining the modifications so that they decrease from the center towards the edges of the image (for example according to the Gauss distribution), there will be provided in the retouching area a retouching degree which increases or decreases progressively.