話不多說，直接上代碼

import java.awt.image.BufferedImage;

import java.awt.image.Raster;

import java.io.File;

import java.io.IOException;

import javax.imageio.ImageIO;

public class IOUtil {

public static void pgm2png(String src, String dest) throws IOException {

BufferedImage image = ImageIO.read(new File(src));

Raster source = image.getRaster();

int width = image.getWidth();

int height = image.getHeight();

// 創建BufferedImage對象

// BufferedImage image2 = new BufferedImage(width,

// height,BufferedImage.TYPE_BYTE_BINARY);//黑色

BufferedImage image2 = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY);// 灰色

// BufferedImage image2 = new BufferedImage(width, height,

// BufferedImage.TYPE_BYTE_INDEXED);//黃色

image2.setData(source);

// 保存文件

ImageIO.write(image2, "png", new File(dest));

}

}

上述代碼中，有幾個參數需要在格式轉換的時候調整。\

new BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY)的第三個參數，圖片格式類型

ImageIO.write(image2, "png", new File(dest)); 的第二個參數，轉換的目標圖片格式