image Fidelity Assessment (iFAS) is a software tool designed to assist image quality researchers providing easy access to a range of state-of-the-art measures which can be applied on a single pair of images and/or in a full database, as well as intuitive visualizations that aid data analysis, e.g., images and histograms of pixel-wise image differences, scatter plots and correlation analysis. The software is freely available for non-commercial use.