Resampling - which algorithm is best?

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Lasse
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Resampling - which algorithm is best?

Post by Lasse »

Hello!

When I resample a picture .. which method is the best?
Where are the pros/cons?

Is there an overview? (Gaussian, Nearest neighbour,...)

Regards,
Lasse
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Olivier_G
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Check that one

Post by Olivier_G »

In addition to making an excellent Editing software (Picture Window Pro), Jonathan Sachs has written some excellent White Papers. Check this one about Resampling methods (PDF).

Olivier
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helmut
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Re: Resampling

Post by helmut »

Lasse wrote:When I resample a picture .. which method is the best?
Where are the pros/cons?

Is there an overview? (Gaussian, Nearest neighbour,...)
"Lanczos" resampling is recommended and gives best results in most cases. More details in the document Olivier pointed to.
Lasse
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Re: Resampling

Post by Lasse »

I did some resample-examples by myself!

See it here:
http://www.lassekolb.info/gim30_vergleich.htm (2.4 MB, Description in German)

Some more examples (other images, shrinking) will follow.

Regards,
Lasse
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helmut
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Re: Resampling

Post by helmut »

Lasse,
Lasse wrote:I did some resample-examples by myself!
thank you for testing this and providing this info to other people!

The important bit of your tests is that you do Upsizing, which means enlarging an existing image. The algorithms will surely do that, but for all I know they work better for downsizing. When downsizing (making the image smaller) the results may differ and I think that Lanczos should be one of the best, then.

Greetings, Helmut
wfa
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Re: Resampling

Post by wfa »

Lasse wrote: Sun Jan 16, 2005 10:27 pm I did some resample-examples by myself!

See it here:
http://www.lassekolb.info/gim30_vergleich.htm (2.4 MB, Description in German)

Some more examples (other images, shrinking) will follow.

Regards,
Lasse
Can any one update the link? Thanks
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