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How is image downsized when "Image is too big to fit on screen"?

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KAE
KAE on 19 Mar 2018
Commented: KAE on 20 Mar 2018
When displaying an image in imshow, I get the error that "Image is too big to fit on screen; displaying at 67%" and I notice Moire patterns in the resulting image. I'd like to know how the image is downsized to display at reduced size. Is it subsampled, or something else?

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Accepted Answer

Steve Eddins
Steve Eddins on 20 Mar 2018
Nearest-neighbor interpolation.

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KAE
KAE on 20 Mar 2018
Thanks so much! This page has a nice demo of how nearest neighbor (and other downsampling algorithms) can introduce Moire, while some filtering beforehand can prevent it.

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