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Re: Neither CONGRID nor REBIN...? [message #48700]

Wed, 17 May 2006 10:52

news.verizon.net
Messages: 47
Registered: August 2003

Member

The /INTERP keyword to CONGRID does use linear interpolation but as the
documentation notes:

REBIN averages multiple points when shrinking an array, while CONGRID
just resamples the array.

For example, if you are shrinking to a size that is an exact multiple
(e.g. from 500 x 500 to 100 x 100) then adding the /INTERP keyword to
CONGRID does absolutely nothing, since each pixel in the output image
can be precisely mapped to a pixel on the input image. If you are
not shrinking to an exact mulitple of the input size (e.g. 500 x 500 to
99 x 99) , then /INTERP provides more precise sampling, but still only
samples every ~5th pixel rather than averaging.

--Wayne

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[Message index]

		Re: Neither CONGRID nor REBIN...? By: news.verizon.net on Wed, 17 May 2006 10:52
		Re: Neither CONGRID nor REBIN...? By: Michael Galloy on Wed, 17 May 2006 08:30
		Re: Neither CONGRID nor REBIN...? By: James Kuyper on Wed, 17 May 2006 07:05
		Re: Neither CONGRID nor REBIN...? By: greg michael on Wed, 17 May 2006 04:18
		Re: Neither CONGRID nor REBIN...? By: Wayne Landsman on Wed, 17 May 2006 03:29

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