1. A method for segmenting a color image composed of pixels, which has been captured using a digital microscope, wherein the digital microscope captures images by an electronic image converter, said method comprising the steps of: selecting a color present in the color image to be segmented, wherein said color represents a region to be segmented of the color image; providing the colors assigned to the pixels and the color selected in the color image in accordance with a first color model based on three color stimuli; determining a clearance for each of the pixels, which represents a distance between the color selected in the color image and the color of the corresponding pixel in accordance with the first color model; checking to determine whether the color selected in the color image is achromatic; determining intensity values for the colors assigned to the pixels and for the color selected in the color image if the selected color is achromatic; assigning one of the pixels to the segmented region when the color selected in the color image is achromatic, and when the clearance assigned to the corresponding pixel is below a settable threshold value, and when the intensity value assigned to the corresponding pixel is within a settable interval around the intensity value assigned to the color selected in the color image; providing the colors assigned to the pixels and the color selected in the color image in accordance with a perception-oriented second color model, for which purpose at least in each case one hue is determined for the colors assigned to the pixels and for the color selected in the color image when the color selected in the color image is not achromatic; and assigning one of the pixels to the segmented region when the color selected in the color image is not achromatic and when the clearance assigned to the corresponding pixel is below a settable threshold value, and when the hue assigned to the corresponding pixel is within a settable interval around the hue assigned to the color selected in the color image; displaying an indication of the segmented color image on a display unit.