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Re: interpolation for resizing [message #64161 is a reply to message #64159] Wed, 03 December 2008 02:13 Go to previous messageGo to previous message
Craig Markwardt is currently offline  Craig Markwardt
Messages: 1869
Registered: November 1996
Senior Member
On Dec 2, 11:07 pm, David Fanning <n...@dfanning.com> wrote:
> Chris writes:
>> One potential issue with this approach is that IDL may interpolate
>> between your 9999 values and your real data values when you expand the
>> array. If you set the 9999s to !values.f_nan beforehand, then the
>> interpolation will behave more sensibly.
>
> I deliberately used CONGRID without the INTERP keyword
> to avoid this problem. Nearest neighbor interpolation
> does not create any data that is not present in the
> original image.

That's true, but nearest-neighbor sampling also adds high-frequency
aliases, so what one uses to interpolate does depend on what one
needs.

Craig

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