Re: [APML] Scaling Images (was: Cocoon Nebula)

["Mike Cook, AF9Y" <mwcook@concentric.net>]

   This is really interesting.  What settings did you use for the
jpeg and GF compression?  I can see a grid in both images,
but less so in the GF.  The grid lines appear to be the point
of shifting.  I thought that jpeg compression was just
in the color data and produced no image displacement.


Date sent:      	Tue, 06 Nov 2001 22:26:27 -0500
To:             	astro-photo@seds.org
From:           	Matt BenDaniel <matt@starmatt.com>
Subject:        	[APML] Scaling Images (was: Cocoon Nebula)
Send reply to:  	astro-photo@seds.org

> At 06:16 PM 11/6/2001 +0100, Mikkel Steine wrote:
> >...I know from my days in desktop
> >publishing that Photoshop is not always the preferred tool for scaling images.
> >There are numerous techniques for resampling an image, and it would be fun to
> >try out some of them...
> 
> Mikkel,
> 
> I downloaded the free evaluation version of Genuine Fractals. Using GF I scaled the image
> down to the exact same size (703x640) as my PS JPG and uploaded it to my web site:
> 
> http://people.ne.mediaone.net/mbendaniel1/gallery/astro/cocoon.html
> 
> You can toggle to the PS scaled by moving mouse over image.
> 
> The pixels patterns resulting from GF are slightly different than Photoshop bicubic. The
> GF stars are sharper and less smeared. The JPG size of the GF image is larger, which may
> be an indication that GF preserves more information from the original image.
> 
> It is very curious how the image annoyingly shifts around when you toggle between the two.
> Could PS or GF be screwing up its scaling? -- Matt BenDaniel http://starmatt.com
> 
> 
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Mike Cook, AF9Y
http://www.webcom.com/af9y
mwcook@cris.com




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