The visual analysis of retina and of its vascular characteristics isimportant in the diagnosis and monitoring of diseases of visual perception. Inthe related medical diagnoses, the digital processing of the fundus images isused to obtain the segmentation of retinal vessels. However, an imagesegmentation is often requiring methods based on peculiar or complexalgorithms: in this paper we will show some alternative approaches obtained byapplying freely available tools to enhance, without a specific segmentation,the images of the fundus of the eye. We will see in particular, that combiningthe use of GIMP, the GNU Image Manipulation Program, with the wavelet filter ofIris, a program well-known for processing astronomical images, the result isgiving images which can be alternative of those obtained from segmentation.
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