问题
Is there any good Scala or Java library for image manipulation? For simple tasks like composing an image with some others then generating a thumb?
回答1:
they're all a bit old school, and maybe inconvenient, but java.awt, java.awt.image, and javax.imageio has everything you need to blend and rescale images. You can find some blending example code e.g. here
http://www.curious-creature.org/2006/09/20/new-blendings-modes-for-java2d/
you can find some examples of rescaling and generating image bytes e.g. here
https://sourceforge.net/projects/ssim/?source=directory
there are probably newer/easier solutions, but these do work.
回答2:
There are also a lot of nice image filters in this Open Source library:
http://www.jhlabs.com/ip/filters/
回答3:
It's not Scala-specific, but ImgLib2 is a full-powered Java image processing library. It's geared towards scientific/low level use, so it might not be as easy as you want for what you're looking for, but it can almost certainly manage anything you're likely to want.
回答4:
Since the question is tag with java-2d you know you can use any Java library. A quick google revealed this SO answer:
open source image processing lib in java
回答5:
Take a look at https://github.com/sksamuel/scrimage (Disclaimer: I am the author)
This is an open source Scala image library that essentially wraps java.awt Image operations in a nicer API.
You asked how to generate a thumbnail, you would do something like.
val in = ...// some input stream
val out = ... // some output stream
Image(in).scale(300,400).write(out, Png)
You can change the scaling method (Bicubic by default) and the output format.
来源：https://stackoverflow.com/questions/12887428/scala-library-for-image-creation