java 图像压缩
Posted 空明流光
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import java.awt.Graphics2D; import java.awt.Image; import java.awt.RenderingHints; import java.awt.color.ColorSpace; import java.awt.geom.AffineTransform; import java.awt.image.AffineTransformOp; import java.awt.image.BufferedImage; import java.awt.image.ColorConvertOp; import java.io.ByteArrayOutputStream; import java.io.File; import java.util.Base64; import javax.imageio.ImageIO; public class Program { public static void main(String[] args) throws Exception { int maxWidth = 800; int maxHeight = 600; BufferedImage image = ImageIO.read(new File("E:\Desktop\IMG20200322201448.jpg")); image = zoomImageFromWidthAndHeight(image,maxWidth,maxHeight); ImageIO.write(image, "jpg", new File("E:\Desktop\IMG20200322201448(" + maxWidth + "x" + maxHeight + ").jpg")); System.out.println("OK"); } public static BufferedImage grayImage(final BufferedImage srcImg) { int iw = srcImg.getWidth(); int ih = srcImg.getHeight(); Graphics2D srcG = srcImg.createGraphics(); RenderingHints rhs = srcG.getRenderingHints(); ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY); ColorConvertOp theOp = new ColorConvertOp(cs, rhs); BufferedImage dstImg = new BufferedImage(iw, ih, BufferedImage.TYPE_INT_RGB); theOp.filter(srcImg, dstImg); return dstImg; } public static BufferedImage zoomImageFromWidthAndHeight(BufferedImage bufImg, int maxWidth, int maxHeight) { int actualWidth = bufImg.getWidth(); int actualHeight = bufImg.getHeight(); if(((double)maxWidth*(double)actualHeight/(double)actualWidth)*(double)maxWidth < ((double)maxHeight*(double)actualWidth/(double)actualHeight)*(double)maxHeight) { actualHeight = (int)((double)maxWidth * (double)actualHeight / (double)actualWidth); actualWidth = maxWidth; } else { actualWidth = (int)((double)maxHeight * (double)actualWidth / (double)actualHeight); actualHeight = maxHeight; } double wr = 0,hr = 0; Image Itemp = bufImg.getScaledInstance(actualWidth, actualHeight, bufImg.SCALE_SMOOTH);//设置缩放目标图片模板 wr = actualWidth*1.0 / bufImg.getWidth(); hr = actualHeight*1.0 / bufImg.getHeight(); AffineTransformOp ato = new AffineTransformOp(AffineTransform.getScaleInstance(wr, hr), null); Itemp = ato.filter(bufImg, null); return (BufferedImage) Itemp; } }
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