[英]Retrieving pixel data from Java Image
Recently I have been attempting to scale pixel arrays (int[]) in Java. 最近,我一直在尝试缩放Java中的像素数组(int [])。 I used .setRGB() to add all my pixel data into the BufferedImage.
我使用.setRGB()将所有像素数据添加到BufferedImage中。 BufferedImage then offers a function called .getScaledInstance().
然后,BufferedImage提供了一个名为.getScaledInstance()的函数。 This should work great for my purposes, but I ran into a problem.
这对我来说应该很好用,但是我遇到了一个问题。 .getScaledInstance() returns a Image, not a BufferedImage.
.getScaledInstance()返回一个Image,而不是BufferedImage。 With an Image object, I cannot use .getRGB() to add all the pixel data (in int[] form) from the scaled Image back into an array.
对于Image对象,我无法使用.getRGB()将缩放后的Image中的所有像素数据(以int []形式)加回到数组中。 Is there a way to get raw pixel data from an Image file?
有没有办法从图像文件中获取原始像素数据? Am I missing something?
我想念什么吗? I looked at other questions and did a bit of googling, and they only seemed to be wanting to get picture data in a different form of array (int[][]) or in bytes.
我查看了其他问题,并进行了一些谷歌搜索,他们似乎只是想以不同形式的数组(int [] [])或以字节为单位获取图片数据。 Any help would be appreciated, thanks.
任何帮助,将不胜感激,谢谢。 Also, Sprite is a class I made that is being used.
另外,Sprite是我正在使用的一类。 Here is my code:
这是我的代码:
public Sprite scaleSprite(Sprite s, int newWidth, int newHeight){
BufferedImage image = new BufferedImage(s.getWidth(), s.getHeight(), BufferedImage.TYPE_INT_RGB);
for(int y = 0; y < s.getHeight(); y++){
for(int x = 0; x < s.getWidth(); x++){
image.setRGB(x, y, s.getPixel(x, y));
}
}
Image newImage = image.getScaledInstance(newWidth, newHeight, Image.SCALE_AREA_AVERAGING);
Sprite newS = new Sprite(newWidth, newHeight);
int[] pixels = new int[newWidth * newHeight];
newImage.getRGB(0, 0, newWidth, newHeight, pixels, 0, newWidth); //This is where I am running into problems. newImage is an Image and I cannot retrieve the raw pixel data from it.
newS.setPixels(pixels);
return newS;
}
To be clear, getScaledInstance()
is a method of Image
, not BufferedImage
. 需要明确的是,
getScaledInstance()
是Image
的方法,而不是BufferedImage
。 You don't generally want to revert to working directly with the Image
superclass once you're working with BufferedImage
; 通常,在使用
BufferedImage
,您通常不想恢复直接使用Image
超类; Image
is really not easy to work with. Image
确实不容易使用。
Please see if this will help: How to scale a BufferedImage 请查看这是否有帮助: 如何缩放BufferedImage
Or from Scaling a BufferedImage , where they yield the following example: 或通过缩放BufferedImage ,它们产生以下示例:
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
public class Main {
public static void main(String[] argv) throws Exception {
BufferedImage bufferedImage = new BufferedImage(200, 200,
BufferedImage.TYPE_BYTE_INDEXED);
AffineTransform tx = new AffineTransform();
tx.scale(1, 2);
AffineTransformOp op = new AffineTransformOp(tx,
AffineTransformOp.TYPE_BILINEAR);
bufferedImage = op.filter(bufferedImage, null);
}
This will give you the ability to scale entirely at the level of BufferedImage
. 这将使您能够完全在
BufferedImage
级别缩放。 From there you can apply whatever sprite specific or array data algorithm you wish. 从那里,您可以应用所需的任何特定于精灵的算法或数组数据算法。
You can draw the resulting Image
onto a BufferedImage
like this: 您可以像这样将生成的
Image
绘制到BufferedImage
:
Image newImage = image.getScaledInstance(newWidth, newHeight, Image.SCALE_AREA_AVERAGING);
BufferedImage buffImg = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_4BYTE_ABGR);
Graphics2D g2 = (Graphics2D) buffImg.getGraphics();
g2.drawImage(newImage, 0, 0, 10, 10, null);
g2.dispose();
Or you can scale the image directly by drawing it on another BufferedImage
: 或者,您可以通过在另一个
BufferedImage
上绘制图像来直接缩放图像:
BufferedImage scaled = new BufferedImage(newWidth, newWidth, BufferedImage.TYPE_4BYTE_ABGR);
Graphics2D g2 = (Graphics2D) scaled.getGraphics();
g2.drawImage(originalImage, 0, 0, newWidth, newWidth, 0, 0, originalImage.getWidth(), originalImage.getHeight(), null);
g2.dispose();
The second approach will work correctly if the two BufferedImages
have the same aspect ratio. 如果两个
BufferedImages
具有相同的宽高比,则第二种方法将正常工作。
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