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Re: Neither CONGRID nor REBIN...? [message #48711 is a reply to message #48710]

Wed, 17 May 2006 03:29

Wayne Landsman
Messages: 117
Registered: January 1997

Senior Member

"greg michael" <greg.michael@gmail.com> wrote in message
news:1147859650.649956.118330@i40g2000cwc.googlegroups.com.. .
>
> I want to reduce an image by an arbitrary factor and have that it still
> looks ok - i.e. the pixels should be somehow averaged, not just
> sampled. CONGRID can handle the arbitrary part and REBIN the averaging
> part, but neither both. Anyone know a simple solution?

You might try the function frebin.pro in
http://idlastro.gsfc.nasa.gov/ftp/pro/image/frebin.pro
From the documentation

; EXPLANATION:
; FREBIN is an alternative to CONGRID or REBIN. Like CONGRID it
; allows expansion or contraction by an arbitary amount. ( REBIN requires
; integral factors of the original image size.) Like REBIN it conserves
; flux by ensuring that each input pixel is equally represented in the
output
; array. The fact that frebin.pro conserves flux might be overkill
for you since you just want to ensure that the reduced image looks OK. But
image reduction should run pretty quickly.--Wayne Landsman

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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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