设定PNG的bKGD

 

一，参考资料

 PNG结构说明 http://homepage2.nifty.com/sophia0/png.html

 JavaSample http://www.java.net/node/707282

 JavaSource http://www.docjar.com/html/api/com/sun/imageio/plugins/png/PNGMetadata.java.html

 

二，JavaSample

    private void writeImageLocal(final String fileName, final BufferedImage image) throws Exception {

        if (fileName == null || "".equals(fileName.trim())) {
            throw new Exception("fileName is null or empty");
        }
        if (image == null) {
            throw new Exception("BufferedImage is null");
        }

        PNGMetadata png = new PNGMetadata();
        png.bKGD_present = true;
        png.bKGD_colorType = 2;
        png.bKGD_red = 123;
        png.bKGD_green = 123;
        png.bKGD_blue = 123;
        
        IIOImage iioImage = new IIOImage(image, null, png);
        
        ImageWriter writer = ImageIO.getImageWritersByFormatName("png").next();
        writer.setOutput(ImageIO.createImageOutputStream(new File(fileName)));
        writer.write(iioImage);
        writer.dispose();
    }

 

三，链接中有一个查看PNG结构的工具。

 

 

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