Downloads Meterological Images (visible band) from Himawari 8 Geo-stationary Satellite, colour corrects it and sets desktop with realtime images

Himawari8SatDesktop.java

/*
 *  Himawari 8 Satellite
 *  Chaidhat Chaimongkol  2 May 2019
 *  Downloads Meterological Images (visible band) from http://www.jma.go.jp/jma/en/menu.html and sets desktop with realtime, colour corrected, geo-stationary images
 *  The Japan Meterological Agency's Himawari Geostationary Satellite
 *
 *	Sets desktop wallpaper to realtime image of Himawari every 10 minutes, which are recent from 5-15 minutes
 *  	For ONLY Mac Mojave ++, uses Java and Applescript and exported as .jar file.
 *	Created for no reason at all, all code is Chai's
 *
 *	IMPORTANT: FOR MAC MOJAVE AND ALSO ADD A FOLDER ON DESKTOP CALLED 'image'!!!
 *	Color correction reference to: https://loneskyimages.blogspot.com/2017/05/himawari-8-color-correction.html
 *	GIMP color correction: https://docs.gimp.org/2.6/en/plug-in-colors-channel-mixer.html
 *  	AP and Java Integration: https://alvinalexander.com/blog/post/java/how-run-multi-multiple-line-applescript-java-program
 *  	Other than that, documentation were used for Applescript and Java.
 * 
 *  ![Screenshot 2019-05-04 at 6 02 05 pm](https://user-images.githubusercontent.com/41228307/57180814-f4e21200-6e7b-11e9-9f9c-f3b15c58158a.png)
*   Compile it to jar file and run. It assumes your in 7+UTC
 */


package NonAcademic;

import java.util.Scanner;

import javax.imageio.ImageIO;

import org.omg.CORBA.portable.InputStream;

import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.net.URL;
import java.util.Date;
import java.util.TimeZone;
import java.util.concurrent.TimeUnit;
import java.text.SimpleDateFormat;

public class Himawari8SatDesktop
{
	public static String yr, d, m, hr, min = "00";
	static float rt = 0, gt = 0, bt = 0, rot = 0, got = 0, bot = 0, r, g, b, rc, gc, bc, ro, go, bo, h = 0, s = 0, l = 0, max, minn, t1, t2;
	  public static void main(String[] args) throws IOException, InterruptedException
	  { 
		  while (true)
		  {
	  		// get the date and time UTC
	  		Date date = new Date();
	  		SimpleDateFormat dateFormat = new SimpleDateFormat("dd-MM-yyyy HH:mm:ss");
	  		dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
	  		yr = dateFormat.format(date).substring(6, 10);

	  		d = buffer(Integer.parseInt(dateFormat.format(date).substring(0, 2)));
	  		m = buffer(Integer.parseInt(dateFormat.format(date).substring(3, 5)));

	  		// get 5 minutes ago because JMA upload it 5 minutes after the picture was taken.
	  		// round it to ten minutes
	  		int hoffset = 0;
	  		System.out.println(Math.floor((((float)(Integer.parseInt("55"))) - 5) / 10) * 10);
	  		if (Math.floor(((float)(Integer.parseInt(dateFormat.format(date).substring(14, 16))) - 5) / 10) * 10 < 0)
	  		{
	  			hoffset = 1;
	  			min = "50";
	  		}
	  		else
	  		{
	  			min = buffer((int)Math.floor(((float)(Integer.parseInt(dateFormat.format(date).substring(14, 16))) - 5) / 10) * 10);
	  		}
	  		hr = buffer(Integer.parseInt(dateFormat.format(date).substring(11, 13)) - hoffset % 24);
	  		System.out.println(dateFormat.format(date));
	  		System.out.println(yr + m + d + hr + min);
		  
		  	// new image
		  	BufferedImage inImage = null;
	        try{
	 			
	 			// jma uses format yr m d hr min -00 so like 201905040110-00
	            URL url =new URL("http://www.jma.go.jp/en/gms/imgs_c/6/visible/1/" + yr + m + d + hr + min + "-00.png");
	            // read the url
	           inImage = ImageIO.read(url);
	           
	           // image colour correction
	           
		        // Image dimensions
		   		int imageWidth = inImage.getWidth();
		   		int imageHeight = inImage.getHeight();
		   		
		   		BufferedImage outImage = new BufferedImage(imageWidth, imageHeight,BufferedImage.TYPE_INT_ARGB);
		   		
		   		// determine luminosity (add all RGB and color corrected RGB) to preform Color Channel mixing with preserved luminosity
		   		System.out.println("download complete, colour correction");
		   		for (int x = 0; x < outImage.getWidth(); x++) {
		   			for (int y = 0; y < outImage.getHeight(); y++) {
		   				// get RGB of pixel xy
		   				r = new Color(inImage.getRGB(x,y)).getRed();
		   				g = new Color(inImage.getRGB(x,y)).getGreen();
		   				b = new Color(inImage.getRGB(x,y)).getBlue();

		   				// colour corrected
		   				rot += (r + (g * 0.125)) / 255;
	   					got += ((r * 0.25) + g) / 255;
	   					bot += ((r * 0.125) + b) / 255;
	   					
	   					// raw colour
		   				rt += r / 255;
		   				gt += g / 255;
		   				bt += b / 255;
		   			}
		   		}
		   		
		   		// luminosity multiplier to preserve luminosity
		   		rc = rt / rot;
		   		gc = gt / got;
		   		bc = bt / bot;
		   		
		   		for (int x = 0; x < outImage.getWidth(); x++) {
		   			for (int y = 0; y < outImage.getHeight(); y++) {
		   				r = new Color(inImage.getRGB(x,y)).getRed();
		   				g = new Color(inImage.getRGB(x,y)).getGreen();
		   				b = new Color(inImage.getRGB(x,y)).getBlue();
		   				int pixelColorInt;

		   				// that blue band at the bottom is removed
		   				if (r == 0 && g == 0 && b == 128)
		   				{
		   					pixelColorInt = new Color(0, 0, 0, 255).getRGB();
		   				}
		   				else
		   				{
		   					// colour channel change
		   					// red = 25% green
		   					// green = 50% red
		   					// blue = 25% red
		   					ro = Math.min((float) (r + (g * 0.125)) * rc,254) / 255;
		   					go = Math.min((float) ((r * 0.25) + g) * gc,254) / 255;
		   					bo = Math.min((float) ((r * 0.125) + b) * bc,254) / 255;

		   					// convert RGB to HSV
		   					float[] hsv = new float[3];
		   					Color.RGBtoHSB((int) (ro * 255), (int) (go * 255),(int) (bo * 255),hsv);
		   					// Hue change by 0.139 deg
		   					// Sat change by 200
		   					hsv[0] *= 1.05;
		   					//hsv[1] -= 0.5f;
		   					hsv[1] *= 2f;
		   					//hsv[1] += 0.5f;
		   					hsv[1] = Math.min(Math.max(hsv[1], 0), 1);
		   					ro = (float)new Color(Color.HSBtoRGB(hsv[0], hsv[1], hsv[2])).getRed() / 255;
		   					go = (float)new Color(Color.HSBtoRGB(hsv[0], hsv[1], hsv[2])).getGreen() / 255;
		   					bo = (float)new Color(Color.HSBtoRGB(hsv[0], hsv[1], hsv[2])).getBlue() / 255;
		   					
		   					// Constrast filter, applied in RGB because I have no idea how HSB works.
		   					ro = Math.min((((ro * 255) - 0.7f) * 1.1f) + 0.7f * 2f, 254) / 255;
		   					go = Math.min((((go * 255) - 0.7f) * 1.1f) + 0.7f * 2f, 254) / 255;
		   					bo = Math.min((((bo * 255) - 0.7f) * 1.1f) + 0.7f * 2f, 254) / 255;
		   					
		   					// 0.0-1.0 color, not 0-255
		   					// now set color to the RGB.
		   					pixelColorInt = new Color(ro, go, bo, 1).getRGB();
		   				}
		   				
		   				outImage.setRGB(x, y, pixelColorInt);
		   			}
		   		}
		   		System.out.println("writing file");
	 
	            // for png
	            ImageIO.write(outImage, "png",new File("/Users/chaidhatchaimongkol/Desktop/image/image" + yr + m + d + hr + min + ".png"));
	 
	            System.out.println("done! Setting background...");
	        }catch(IOException e){
	        	// write applescript and execute
	            e.printStackTrace();
	        }
			
	    new Himawari8Sat();
	    System.out.println("end. " + hr + min);
	    TimeUnit.MINUTES.sleep(1);
		  }
		  }
	  //}
	  
	  public Himawari8Sat()
	  {
	  	// https://alvinalexander.com/blog/post/java/how-run-multi-multiple-line-applescript-java-program
	    Runtime runtime = Runtime.getRuntime();
	    
	    // an applescript command that is multiple lines long.
	    // just create a java string, and remember the newline characters.
	    String applescriptCommand =  
	    		"tell application \"Finder\" to set a to (desktop picture) as string\n" +
	    	    		"tell application \"Image Events\"\n" +
	    				"launch\n" +
	    		"set Wallpaper to open \"~/Desktop/image/image" + yr + m + d + hr + min + ".png\"\n" +
	    				"pad Wallpaper to dimensions {2000, 1800} with pad color {0, 0, 0}\n" +
	    		"save Wallpaper\n" +
	    				"close Wallpaper\n" +
	    		"end tell\n" + 
	    		"if (a contains \"Macintosh HD:Users:chaidhatchaimongkol:Desktop:image\" or a is \"Macintosh HD:Users:chaidhatchaimongkol:Desktop:image1.png\") then\n" +
	    		"tell application \"System Events\"\n" + 
	                                   "tell current desktop\n" +
	                                   "set picture to \"~/Desktop/image/image" + yr + m + d + hr + min + ".png\"\n" + 
	                                   "end tell\n" +
	                                   "end tell\n" +
	                                   "end if";

	    String[] args = { "osascript", "-e", applescriptCommand };

	    try
	    {
	      Process process = runtime.exec(args);
	    }
	    catch (IOException e)
	    {
	      e.printStackTrace();
	    }
	  }
	  
	  public static String buffer (int y)
	  {
		  String x = Integer.toString(y);
		  if (x.length() == 1)
			  return "0" + x;
		  if (x.length() == 2)
			  return x;
		  return "";
	  }
	
} //Himawari8Sat

hi @chaidhat! Thanks for your excellent work. But it seems not working now (e.g. the website has changed). Could you please kindly take a look and make some necessary updates? :)

Hi @JinBridger thanks for expressing interest in this! Unfortunately, I don't have enough time to work on it atm -- please feel free to modify/redistribute it though, it's licensed under MIT! :)
If you have any qs please email me at chaimongkol at ucla dot edu since I don't check Github that often!