To do border emphasis treatment in the border emphasis

摘要

PURPOSE: To reproduce a contour part whose contour is emphasized keeping a normal color balance in the case where a color image is recorded onto a color recording material whose sensitivity is different according to color. CONSTITUTION: Image data of an yellow image are read out of a frame memory 28 in the case of printing and color is corrected by an image processing section 32 and the result is fed to a contour emphasis processing section 33. The contour emphasis processing section 33 multiplies a contour emphasis coefficient for an yellow image read out of a memory 34 with a sum of differences between image data of picture elements whose contour is to be emphasized and image data of 8 picture elements in the vicinity and image data of the picture elements whose contour is to be emphasized are added to the product. After thermal recording of the yellow image, a magenta image and a cyan image are sequentially thermally recorded. The images are subject to contour emphasis and the contour emphasis coefficient used in this case depends on color.