[magick-users] Luminance diff in magick tool

[Anthony Thyssen]

"Wei Guo" on  wrote...
| Hi Fred,
| 
| Thanks a lot for help. I tried to convert both of them in Luminance space
| and then do the compare. I got the result as below:
| 
| 2909.9(0.0444022)
| 
| For square root RMSE .... (sq)root mean squared error -- IE:  sqrt(MSE), is
| it too big? So I have to see those two images are different?
| 
As the value has been given a square-root, it is now equivelent to a
normal color space difference.  As such the parenthesis is provided
to let you know how this matches against the IM 'quantum range' or
maximum color value.

In other words your image is only on average (mean) 4.44% different.

Of course that does not tell you how much of the image is different, or
if it is a universal (say general noise, or even just a JPEG lossiness)
or localized difference (spam text, logo, or watermark).


  Anthony Thyssen ( System Programmer )    <A.Thyssen at griffith.edu.au>
 -----------------------------------------------------------------------------
   Writing software takes twice as long as you expect it will take...
                  Even if you keep this in mind!
 -----------------------------------------------------------------------------
     Anthony's Home is his Castle     http://www.cit.gu.edu.au/~anthony/