MetricType

structural dissimilarity index

structural similarity index

root mean squared (normalized root mean squared)

perceptual hash for the sRGB and HCLp colorspaces. Specify an alternative colorspace with -define

peak signal to noise ratio

peak absolute (normalized peak absolute)

normalized cross correlation

mean error squared, average of the channel error squared

mean error per pixel (normalized mean error, normalized peak error)

mean absolute error (normalized), average channel error distance

mean color distance

absolute error count, number of different pixels (-fuzz affected)