1. A method of predicting and processing image fine structures, in which the pixel values of the original image separated into pixels for each of the CMY or CMYK plates are converted to pixel values for predicting image fine structures which will appear in a printed halftone image, characterized in that the values of the pixel to be converted and neighboring pixels are subjected to weighted averaging with adjustable weights dependent on the period of grid units that is determined by the screen ruling and screen angle for said printed halftone image.