[Insight-users] Debug error in filter example DerivativeImageFilter

[Dhananjay244]

hello john,

the output file in the syntax should be of .mhd instead of .png while
implementing derivativeimagefilter.

as for the order, 0 is for derivative in y direction and 1 is for derivative
in x direction.

for eg,

DerivativeImageFilter.exe input.png output.mhd normalize.png 1 0

is the syntax for obtaining the 1st order derivative of the image in Y
direction

DerivativeImageFilter.exe input.png output.mhd normalize.png 1 1

is the syntax for obtaining the 1st order derivative of the image in X
direction.
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