.TH GMERLIN_PSNR 1 "January 2011" Gmerlin "User Manuals" .SH NAME gmerlin_psnr, gmerlin_vpsnr \- compare two images .SH SYNOPSIS .B gmerlin_psnr .br .B gmerlin_vpsnr .SH DESCRIPTION .B gmerlin_psnr will calculate the PSNR between and . The input images should be of the same dimension and format. .B gmerlin_psnr is part of the Gmerlin suite of media applications.