Recently I have been attempting to scale pixel arrays (int[]) in Java. I used .setRGB() to add all my pixel data into the BufferedImage. BufferedImage then offers a function called .getScaledInstance(). This should work great for my purposes, but I ran into a problem. .getScaledInstance() returns a Image, not a 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. Is there a way to get raw pixel data from an Image file? Am I missing something? 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. Any help would be appreciated, thanks. Also, Sprite is a class I made that is being used. Here is my code:
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
. You don't generally want to revert to working directly with the Image
superclass once you're working with BufferedImage
; Image
is really not easy to work with.
Please see if this will help: How to scale a BufferedImage
Or from Scaling a BufferedImage , where they yield the following example:
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
. From there you can apply whatever sprite specific or array data algorithm you wish.
You can draw the resulting Image
onto a BufferedImage
like this:
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
:
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.
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