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How to make java genreated thumbnail sharper

开发者 https://www.devze.com 2022-12-30 14:24 出处:网络
I have thumbnails generated in Java, but not sharp enoug开发者_如何学编程h, why?I\'m getting excellent results with the java-image-scaling library.Possibly because of the kernel you\'ve used.

I have thumbnails generated in Java, but not sharp enoug开发者_如何学编程h, why?


I'm getting excellent results with the java-image-scaling library.


Possibly because of the kernel you've used.

A lanczos filter, for instance, gives relatively sharp results.


I found the best results are produced with Lanczos scale for thumbnails and unsharp mask after that. Most scale algorithms apply as a first step a low pass filter (blur) and sub-sampling after that, this makes scaled down images to look not sharp enough.

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