制作缩略图宽度java

Question

我想制作一个thunbnail图像（调整大小的图像）

这是我的代码

public static void createImage(String loadFile, String saveFile)throws IOException{

        File load_image = new File(loadFile); //가져오는거
        FileInputStream fis = new FileInputStream(load_image);
        File save = new File(saveFile); // 썸네일

        BufferedImage bi = ImageIO.read(fis);

         int width = bi.getWidth();
         int height = bi.getHeight();
         int maxWidth=0;
         int maxHeight=0;

         if(width>height){
             maxWidth = 1280;
             maxHeight = 720;
         }else{
             maxWidth = 720;
             maxHeight = 1280;
         }

         if(width > maxWidth){
             float widthRatio = maxWidth/(float)width;
             width = (int)(width*widthRatio);
             height = (int)(height*widthRatio);
         }

         if(height > maxHeight){
             float heightRatio = maxHeight/(float)height;
             width = (int)(width*heightRatio);
             height = (int)(height*heightRatio);
         }


        BufferedImage thu = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = thu.createGraphics();
        g2.drawImage(bi, 0, 0, width, height, null);
        ImageIO.write(thu, "jpg", save);


    }

有时我的图像颜色会因意外的颜色而改变 这是图像示例

首先是原产地

第二个是缩略图

我不知道为什么...... 哪里我搞错了？

请帮助我......

Answer 1

您使用BufferedImage.TYPE_INT_RGB编写图像。但如果这不是源图像的类型，则颜色会出错。

尝试替换此行

BufferedImage thu = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

由此：

BufferedImage thu = new BufferedImage(width, height, bi.getType());