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In radiotherapy erythema is a common side-effect, especially during radiotherapy treatment regimes that last several weeks. The measurement of erythema might be of clinical relevance, especially when enabling a standardized interpretation. The aim of this article is to present a tool that can be implemented for automatized and time efficient quantification of erythema from digital images taken during radiotherapy treatment. Instead of relying on commercially available graphic editors and performing manual operations on the images within these programs we developed a java based tool that can automatically evaluate the “redness” of images. These erythema values receive a score number, are connected with the date and time the pictures were taken and are exported into a comma separated values (CSV) file. This file can then easily be opened by spreadsheet software (1) to visualize the result in the form of a graph.