java - 在Java中调整图像大小(Resizing image in Java)

Question

I have a PNG image and I want to resize it.

(我有一个PNG图片，我想调整其大小。)

How can I do that?

(我怎样才能做到这一点？)

Though I have gone through this I can't understand the snippet.

(虽然我曾经走过这个我无法理解的片段。)

  ask by Suhail Gupta translate from so

Answer 1

If you have an java.awt.Image , rezising it doesn't require any additional libraries.

(如果您具有java.awt.Image ，则对其进行大小调整不需要任何其他库。)

Just do:

(做就是了：)

Image newImage = yourImage.getScaledInstance(newWidth, newHeight, Image.SCALE_DEFAULT);

Ovbiously, replace newWidth and newHeight with the dimensions of the specified image.

(Ovbiously， 取代 newWidth和newHeight具有指定图像的尺寸。)
Notice the last parameter: it tells to the runtime the algorithm you want to use for resizing.

(注意最后一个参数：它向运行时告知您要用于调整大小的算法 。)

There are algorithms that produce a very precise result, however these take a large time to complete.

(有些算法可以产生非常精确的结果，但是这些算法需要花费大量时间才能完成。)
You can use any of the following algorithms:

(您可以使用以下任何算法：)

• Image.SCALE_DEFAULT : Use the default image-scaling algorithm.

  (Image.SCALE_DEFAULT ：使用默认的图像缩放算法。)

• Image.SCALE_FAST : Choose an image-scaling algorithm that gives higher priority to scaling speed than smoothness of the scaled image.

  (Image.SCALE_FAST ：选择一种图像缩放算法，该算法将缩放速度的优先级高于缩放图像的平滑度。)

• Image.SCALE_SMOOTH : Choose an image-scaling algorithm that gives higher priority to image smoothness than scaling speed.

  (Image.SCALE_SMOOTH ：选择一种图像缩放算法，该算法将图像平滑度的优先级高于缩放速度。)

• Image.SCALE_AREA_AVERAGING : Use the Area Averaging image scaling algorithm.

  (Image.SCALE_AREA_AVERAGING ：使用面积平均图像缩放算法。)

• Image.SCALE_REPLICATE : Use the image scaling algorithm embodied in the ReplicateScaleFilter class.

  (Image.SCALE_REPLICATE ：使用ReplicateScaleFilter类中包含的图像缩放算法。)

See the Javadoc for more info.

(有关更多信息，请参见Javadoc 。)