1. A method for assessing fibrosis in a tissue using a test image which is an image of the tissue, wherein the test image comprises a plurality of pixels having respective intensity values and wherein the method comprises: (1a) automatically identifying, from the test image, a portal collagen area, a septal collagen area and a fibrillar collagen area respectively comprising pixels representing portal collagen, septal collagen and fibrillar collagen of the tissue, the fibrillar collage including collagen in both peri-cellular and peri-sinusoidal spaces; (1b) obtaining quantitative values of one or more features for each identified area based on characteristics of the identified area in the test image; and (1c) assessing fibrosis using the quantitative values obtained for all the identified areas.