如何在Grails/Java中将PNG转换为JPEG

Question

我有一个png文件，并试图将其转换为jpeg。但是所产生的图像具有错误的颜色，粉红色很大。这是我的代码：

        BufferedImage image = null
        BufferedImage imageRGB = null
        image = ImageIO.read(new ByteArrayInputStream(imageBytesPng))
        imageRGB = new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_INT_RGB)
        imageRGB.setData(image.getData())
        ByteArrayOutputStream baos=new ByteArrayOutputStream()
        ImageIO.write(imageRGB, "jpeg", baos)
        baos.flush()
        def outImage = baos.toByteArray()
        baos.close()
        return outImage

我该更改如何使图像颜色像png文件中的图像颜色？

Answer 1

InputStream pngInputStream = ...
OutputStream jpgOutputStream = ...
BufferedImage image = ImageIO.read(pngInputStream));
ImageIO.write(image, "jpeg", jpgOutputStream);

Answer 2

尝试一下。

import javax.media.jai.*;
public class jai_png_jpg 
{
   public static void main(String[] args)throws Exception  
   {
  String filename="input_png.png";
  //Read input PNG as a PlanarImage file
  PlanarImage inputfile = JAI.create("fileload", filename); 
  //write output in JPG Format 
  JAI.create("filestore",inputfile,"jai_jpg_output.jpg","JPEG"); } }