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calculating percentage

i have a new idea for one of my old noise reduction algorithms. so, i'm trying to apply a certain amount of noise reduction to some pixels with slight change, but only if the change or difference is within a certain percentage, lets use 5% or 0.05 in excel. column C is formated as percetange for viewing purposes in this post.

the question is, did i do this correctly ?

Code:

if a pair of pixels is = or greater than 5%, apply filter1
if a pair of pixels is less than 5%, apply filter2

1  A    B    C    D
2  70    70    0%  =abs((a2-b2)*0.05)
3  70    71    5%  =abs((a3-b3)*0.05)
4  70    69    5%  =abs((a4-b4)*0.05)
5  10    20    50%  =abs((a5-b5)*0.05)
6  255  128  635%  =abs((a6-b6)*0.05)


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