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Resampling - which algorithm is best?

Posted: Tue Jan 11, 2005 5:07 pm
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

Check that one

Posted: Tue Jan 11, 2005 5:59 pm
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

Re: Resampling

Posted: Tue Jan 11, 2005 8:42 pm
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.

Re: Resampling

Posted: Sun Jan 16, 2005 10:27 pm
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

Re: Resampling

Posted: Mon Jan 17, 2005 6:50 am
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

Re: Resampling

Posted: Fri Sep 13, 2019 6:48 pm
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

Re: Resampling

Posted: Fri Sep 13, 2019 8:30 pm
by XnTriq