Legacy ImageMagick Discussions Archive

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snibgo wrote:It's the mean, not the maximum.

Thanks snibgo.

Third try then:

dist[ image2 , image1 ] = (257/3)*( mean( abs( R2 - R1)) + mean( abs( G2 - G1) ) + mean( abs( B2 -B1) ) )

>> I saw my error after submission. See below. (Please correct if I am again wrong). dist[ (R2,G2,B2), (R1,G1,B1) ] = (257/3)*( abs( R2 - R1) + abs( G2 - G1) + abs( B2 -B1) ) . should be: dist[ image2 , image1 ] = (257/3)*( max( abs( R2 - R1)) + max( abs( G2 - G1) ) + max( abs( B2 -B1) ) ) where the ...

>> Thanks a lot dlemstra, snibgo, I got it. My IM is indeed using QM 16. With your information, I think I know now the equation that gives the first number in the output for -metric MAE, for the particular case of getting differences between 8bit/color PNG images (R,G,B) where each range is in ...

// Pick a black image RGB (0,0,0) and a white image (255,255,255) and calculate the difference compare -metric MAE black.png white png diff.png 65535 (1) What is the mathematical operation that gives the 65535 result? That is, what is the definition of the function below? dist[ (0,0,0), (255,255,255 ...