More than ten percent of the patients suffering with diabetes have high risk of eye related issues. DR (Diabetic Retinopathy) is an eye ailment which influences majority of the patients having track record of suffering from diabetes for more than ten years. The paper elaborates on the categories of diabetic retinopathy.The research paper is concerned with pre-processing of raw retinal fundus images using green channel, CLAHE, morphological operation, segmentation, and line tracking.