java - 从 imageReader 写回修改后的图像

Question

我从动画 gif 中读取了分离的图像，我只需在 frames[i] 中对它们进行更改，然后将它们设置回文件并使用 writer 保存为新文件。

    File file = new File("gif1.gif");
    ImageReader reader = ImageIO.getImageReadersBySuffix("GIF").next();
    ImageInputStream in = ImageIO.createImageInputStream(file);
    reader.setInput(in);

    File output = new File("k.gif");

    ImageWriter writer = ImageIO.getImageWritersBySuffix("GIF").next();
    ImageOutputStream out = ImageIO.createImageOutputStream(file);
    writer.setOutput(out);

    int numImages = reader.getNumImages(true); 
    BufferedImage[] frames = new BufferedImage[pocetObrazku];

    for (int i = 0; i < numImages; i++)
    {

        BufferedImage image = reader.read(i);
        frames[i] = reader.read(i);        
    }    

我很高兴获得任何帮助。

Answer 1

坦克@StanislavL 评论中的链接(https://community.oracle.com/thread/1264385)，这真的很有帮助。我的解决方案是:

File file = new File("gif1.gif");
ImageReader reader = ImageIO.getImageReadersBySuffix("GIF").next();
ImageInputStream in = ImageIO.createImageInputStream(file);
reader.setInput(in);

int numImages = reader.getNumImages(true); 
BufferedImage[] frames = new BufferedImage[pocetObrazku];

File fileOut = new File("k.gif");
fileOut.createNewFile();
ImageWriter iw = ImageIO.getImageWritersByFormatName("gif").next();

ImageOutputStream ios = ImageIO.createImageOutputStream(fileOut);
iw.setOutput(ios);
iw.prepareWriteSequence(null);

for (int i = 0; i < numImages ; i++) {
    BufferedImage image = reader.read(i);
    frames[i] = reader.read(i);

    IIOMetadata metadata = reader.getImageMetadata(i);    
    IIOImage ii = new IIOImage(image, null, metadata);      
    iw.writeToSequence(ii, (ImageWriteParam) null);    
}