1. An image processing apparatus ( 100 ) for improving an image, which image comprises a plurality of pixels, each having a luminance value, the image processing apparatus comprising: a classification unit ( 102 ) for setting a classification value to a particular pixel based on a difference between the luminance value of the particular pixel and the luminance value of a neighboring pixel of the particular pixel; and an improvement unit ( 104 ) for improving the image by processing the particular pixel of the image based on the classification value of the particular pixel, characterized in that the classification unit ( 102 ) is designed to set the classification value by taking into account that a first color value of the particular pixel is substantially equal to a second color value of a predetermined range of color values.