Introduction This software provides fast implementations of the following objective metrics: PSNR: Peak Signal-to-Noise Ratio, SSIM: Structural Similarity, MS-SSIM: Multi-Scale Structural Similarity, VIFp: Visual Information Fidelity, pixel domain version, PSNR-HVS: Peak Signal-to-Noise Ratio taking into account Contrast Sensitivity Function (CSF), PSNR-HVS-M: Peak Signal-to-Noise Ratio taking int