Image watermarking, scaling and conversion of an input stream

Hello everyone , I meet you again , I'm the king of the whole stack

Watermark and zoom pictures :

 public final static BufferedImage[] pressImage(InputStream srcImg, String waterImg,float alpha) throws IOException {
    	
    	 //File file = new File(targetImg);
        Image image = ImageIO.read(srcImg);
        int width = image.getWidth(null);
        int height = image.getHeight(null);
        BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D g = bufferedImage.createGraphics();
        g.drawImage(image, 0, 0, width, height, null);
    
        Image waterImage = ImageIO.read(new File(waterImg));    //  Watermark file 
        
        int width_1 = waterImage.getWidth(null);
        int height_1 = waterImage.getHeight(null);
        g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));
        
        int div=(int) (0.1*width_1);
          
        for(int y=0,row=0;y<height;y+=height_1+div,row++)
        {
        	int x=0;
        	       	
            for(;x<width;x+=width_1+div)
            {              	
            	g.drawImage(waterImage, x, y, width_1, height_1, null); //  End of watermark file 	                	
            }
        }             
        
        g.dispose();
        
        BufferedImage bufferedImage2=Thumbnails.of(bufferedImage).size(100, 100).asBufferedImage();
        
       
      
       return new BufferedImage[]{bufferedImage,bufferedImage2};
    	
    }

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The zoom of the picture uses Thumbnails This tool ,( In fact, it can also be used to make watermarks , It's just that I haven't studied )

jar Packages or maven Please search by yourself

Special attention should be paid to Thumbnails By default, it is scaled in equal proportion, and its scaling rule is :

If Put the picture in 200*300

* If the horizontal ratio of the picture 200 Small . High ratio 300 Small . unchanged * If the horizontal ratio of the picture 200 Small , High ratio 300 Big . The height is reduced to 300, The scale of the picture is the same * If the horizontal ratio of the picture 200 Big , High ratio 300 Small . Horizontal reduction to 200. The scale of the picture is the same * If the horizontal ratio of the picture 200 Big , High ratio 300 Big . The picture is scaled down , Horizontal 200 Or as high as 300

bufferInage transformation inputSteam

private InputStream getInputstreamFromBufferedImage(BufferedImage img) throws IOException{
		 	ByteArrayOutputStream bs =new ByteArrayOutputStream();
		 	ImageOutputStream imOut =ImageIO.createImageOutputStream(bs);
	        ImageIO.write(img,"jpg",imOut); //scaledImage1 by BufferedImage,jpg Is the type of image 
	        
	        InputStream is =new ByteArrayInputStream(bs.toByteArray());
	        return is;
		
	}

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