如何缩放 BufferedImage [英] How to scale a BufferedImage
本文介绍了如何缩放 BufferedImage的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
按照 javadocs,我尝试缩放 BufferedImage
没有成功这里是我的代码:
Following the javadocs, I have tried to scale a BufferedImage
without success here is my code:
BufferedImage image = MatrixToImageWriter.getBufferedImage(encoded);
Graphics2D grph = image.createGraphics();
grph.scale(2.0, 2.0);
grph.dispose();
我不明白为什么它不起作用,有什么帮助吗?
I can't understand why it is not working, any help?
推荐答案
AffineTransformOp
提供了选择插值类型的额外灵活性.
AffineTransformOp
offers the additional flexibility of choosing the interpolation type.
BufferedImage before = getBufferedImage(encoded);
int w = before.getWidth();
int h = before.getHeight();
BufferedImage after = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);
AffineTransform at = new AffineTransform();
at.scale(2.0, 2.0);
AffineTransformOp scaleOp =
new AffineTransformOp(at, AffineTransformOp.TYPE_BILINEAR);
after = scaleOp.filter(before, after);
显示的片段说明了重采样,而不是裁剪;这个相关的答案解决了issue;在此处检查了一些相关示例.
The fragment shown illustrates resampling, not cropping; this related answer addresses the issue; some related examples are examined here.
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