合并两个图像

Question

我需要在Java中合并两个图像(BufferedImage).如果没有透明度,这不会是一个问题.基本图像已经具有一定的透明度.我希望保持原样并对其应用"掩码",即第二张图像.第二个图像没有不透明像素,实际上它几乎完全透明,只是有一些不太透明的像素来提供某种"光效",就像反射一样.重要细节:我不想在屏幕上执行此操作,使用图形,我需要获得带有合并的BufferedImage.

谁能帮我？谢谢!

细节:合并两个保持透明度的图像.这就是我需要做的.

注意:Java中的Set BufferedImage alpha掩码不能满足我的要求,因为它不能很好地处理具有透明度的两个图像 - 它会修改第一个图像透明度.

Answer 1

只需创建一个具有透明度的新BufferedImage,然后在其上绘制另外两个图像(具有完整或半透明).这是它的样子:

示例代码(图像称为'image.png'和'overlay.png'):

File path = ... // base path of the images

// load source images
BufferedImage image = ImageIO.read(new File(path, "image.png"));
BufferedImage overlay = ImageIO.read(new File(path, "overlay.png"));

// create the new image, canvas size is the max. of both image sizes
int w = Math.max(image.getWidth(), overlay.getWidth());
int h = Math.max(image.getHeight(), overlay.getHeight());
BufferedImage combined = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);

// paint both images, preserving the alpha channels
Graphics g = combined.getGraphics();
g.drawImage(image, 0, 0, null);
g.drawImage(overlay, 0, 0, null);

// Save as new image
ImageIO.write(combined, "PNG", new File(path, "combined.png"));

Answer 2

垂直合并任何类型的文件。

void mergeFiles(List<String> files, String fileName) {
        int heightTotal = 0;
        int maxWidth = 100;

        List<BufferedImage> images = new ArrayList<>();
        try {
            for (String file : files) {
                BufferedImage image = ImageIO.read(new File(file));
                images.add(image);
            }


        for (BufferedImage bufferedImage : images) {
            heightTotal += bufferedImage.getHeight();
            if (bufferedImage.getWidth() > maxWidth) {
                maxWidth = bufferedImage.getWidth();
            }
        }


        int heightCurr = 0;
        BufferedImage concatImage = new BufferedImage(maxWidth, heightTotal, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2d = concatImage.createGraphics();
        for (BufferedImage bufferedImage : images) {
            g2d.drawImage(bufferedImage, 0, heightCurr, null);
            heightCurr += bufferedImage.getHeight();
        }

        File compressedImageFile = new File(fileName);
        OutputStream outputStream = new FileOutputStream(compressedImageFile);

        float imageQuality = 0.7f;
        Iterator<ImageWriter> imageWriters = ImageIO.getImageWritersByFormatName("jpeg");

        if (!imageWriters.hasNext())
            throw new IllegalStateException("Writers Not Found!!");

        ImageWriter imageWriter = imageWriters.next();
        ImageOutputStream imageOutputStream = ImageIO.createImageOutputStream(outputStream);
        imageWriter.setOutput(imageOutputStream);

        ImageWriteParam imageWriteParam = imageWriter.getDefaultWriteParam();

        //Set the compress quality metrics
        imageWriteParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        imageWriteParam.setCompressionQuality(imageQuality);

        //Created image
        imageWriter.write(null, new IIOImage(concatImage, null, null), imageWriteParam);

        // close all streams
        outputStream.close();
        imageOutputStream.close();
        imageWriter.dispose();
        log.info(" Files Merged");
        } catch (IOException e) {
            log.error("Error while merging files :::"+e);
            throw new RuntimeException(e);
        }
    }