Because many signals have a very wide dynamic range, PSNR is usually expressed as a logarithmic quantity using the decibel scale.
PSNR is commonly used to quantify reconstruction quality for images and video subject to lossy compression.
The processing quality of 12-bit images is considered high when the PSNR value is 60 dB or higher.
[10][11] PSNR-HVS[12] is an extension of PSNR that incorporates properties of the human visual system such as contrast perception.
[13] In a 2007 study, it delivered better approximations of human visual quality judgements than PSNR and SSIM by large margin.