This tool computes (dis)similarity between two or more PNG images using an algorithm approximating human vision. Comparison is done using a variant of the SSIM algorithm at multiple weighed resolutions. The value returned is 1/SSIM-1, where 0 means identical image, and >0 (unbounded) is amount of difference.

Values are not directly comparable with other tools, but DSSIM is generally more accurate (according to TID2013 test suite).

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