如何在java中调整缓存的图像n图形2d？

int width = 175; Graphics2D gb = (Graphics2D) g; bufferedimage = (BufferedImage) createImage(width, width); Graphics2D graphics = bufferedimage.createGraphics(); graphics.setColor(/*this.getBackground()*/Color.red); graphics.fillRect(0, 0, width, width); 

嗨，我有缓冲大尺寸…我必须调整缓冲图像… PLZ你能帮助我吗？

Answer 1

 public BufferedImage scaleImage(BufferedImage img, int width, int height, Color background) { int imgWidth = img.getWidth(); int imgHeight = img.getHeight(); if (imgWidth*height < imgHeight*width) { width = imgWidth*height/imgHeight; } else { height = imgHeight*width/imgWidth; } BufferedImage newImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g = newImage.createGraphics(); try { g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC); g.setBackground(background); g.clearRect(0, 0, width, height); g.drawImage(img, 0, 0, width, height, null); } finally { g.dispose(); } return newImage; } 

更新：不同的算法

 import java.awt.Graphics2D; import java.awt.Image; import java.awt.RenderingHints; import java.awt.image.BufferedImage; public enum Resizer { NEAREST_NEIGHBOR { @Override public BufferedImage resize(BufferedImage source, int width, int height) { return commonResize(source, width, height, RenderingHints.VALUE_INTERPOLATION_NEAREST_NEIGHBOR); } }, BILINEAR { @Override public BufferedImage resize(BufferedImage source, int width, int height) { return commonResize(source, width, height, RenderingHints.VALUE_INTERPOLATION_BILINEAR); } }, BICUBIC { @Override public BufferedImage resize(BufferedImage source, int width, int height) { return commonResize(source, width, height, RenderingHints.VALUE_INTERPOLATION_BICUBIC); } }, PROGRESSIVE_BILINEAR { @Override public BufferedImage resize(BufferedImage source, int width, int height) { return progressiveResize(source, width, height, RenderingHints.VALUE_INTERPOLATION_BILINEAR); } }, PROGRESSIVE_BICUBIC { @Override public BufferedImage resize(BufferedImage source, int width, int height) { return progressiveResize(source, width, height, RenderingHints.VALUE_INTERPOLATION_BICUBIC); } }, AVERAGE { @Override public BufferedImage resize(BufferedImage source, int width, int height) { Image img2 = source.getScaledInstance(width, height, Image.SCALE_AREA_AVERAGING); BufferedImage img = new BufferedImage(width, height, source.getType()); Graphics2D g = img.createGraphics(); try { g.drawImage(img2, 0, 0, width, height, null); } finally { g.dispose(); } return img; } }; public abstract BufferedImage resize(BufferedImage source, int width, int height); private static BufferedImage progressiveResize(BufferedImage source, int width, int height, Object hint) { int w = Math.max(source.getWidth()/2, width); int h = Math.max(source.getHeight()/2, height); BufferedImage img = commonResize(source, w, h, hint); while (w != width || h != height) { BufferedImage prev = img; w = Math.max(w/2, width); h = Math.max(h/2, height); img = commonResize(prev, w, h, hint); prev.flush(); } return img; } private static BufferedImage commonResize(BufferedImage source, int width, int height, Object hint) { BufferedImage img = new BufferedImage(width, height, source.getType()); Graphics2D g = img.createGraphics(); try { g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, hint); g.drawImage(source, 0, 0, width, height, null); } finally { g.dispose(); } return img; } };