CODEWITHSUNDEEP
javaimagethumbnailsimage-resizing
user344565
user344565

Reputation: 21

How to make java genreated thumbnail sharper

I have thumbnails generated in Java, but not sharp enough, why?

Upvotes: 2

Views: 721

Answers (3)

Ross
Ross

Reputation: 2096

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.

Upvotes: 2

Michael Borgwardt
Michael Borgwardt

Reputation: 346317

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

Upvotes: 4

Artefacto
Artefacto

Reputation: 97835

Possibly because of the kernel you've used.

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

Upvotes: 3

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