Image to GIF file

MainWork2.java

package CG;

import java.awt.Color;
import java.awt.Graphics;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class MainWork2  extends JPanel {
	private static MyImage[] imgFile = null;
	private static ArrayList<int[]> arrImg = new ArrayList<int[]>();
	private static long pauseTime;

	public static void main(String[] args) throws IOException {
		try {
			ArrayList<File> listOfImg = new ArrayList<File>();
			//input pause time for animate GIF
			while(true) {
				try {
					System.out.print("Enter pause time for animate GIF (millisecond) : ");
					pauseTime = new Scanner(System.in).nextLong();
					
					if(pauseTime >= 0) break;
					else System.err.println("Input value >= 0");
				}catch(Exception e) {
						System.err.println("Input integer only [ >= 0 ]");
					}
				}
			
			//input image file
			while(true){
				System.out.print("Enter absolute path of image folder: ");
				String folderPath = new Scanner(System.in).nextLine();
				File folder = new File(folderPath);
				
				if(folder.isDirectory()) {
					File[] listOfFiles = folder.listFiles();
					
					 for (int i = 0; i < listOfFiles.length; i++) {
						 File file = listOfFiles[i];
						 if (file.isFile() && MyImage.isImage(file)) {	//is file && is image
							 listOfImg.add(file);
							 System.out.println("File: " + file.getAbsoluteFile());
					      }
					 }//for list of files
					 break;
				}else {
					System.err.print("It's NOT a folder\n\n");
				}
			}
			int numFile = listOfImg.size();
			imgFile = new MyImage[numFile];
			
			for(int i=0; i<numFile; i++) {
				imgFile[i] = new MyImage(listOfImg.get(i));
				//convert image to array
				//add array to arrImg
				arrImg.add(imgFile[i].toArray());
			}
			
			//new and set JFrame
			JFrame f = new JFrame();
			f.add(new MainWork2());
			f.setVisible(true);
			f.setResizable(false);
			f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			//set size	//based on the size of the first image.
			f.setSize(imgFile[0].getWidth(),imgFile[0].getHeight());
			f.repaint();
			
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	
	private int state = 0;
	@Override
	 public void paint(Graphics g){
		try {
			if(arrImg != null) {
				System.out.println("State show: "+state);
				
				int width = imgFile[state].getWidth();
				int height = imgFile[state].getHeight();
				int[] img = arrImg.get(state++);
				
				//draw image
				for(int index=0,y=0; y<height; y++) {
					for(int x=0; x<width; x++) {				
						plot(g,x,y,img[index++]);
					}
				}
				Thread.sleep(pauseTime);	//sleep	//pause animate GIF
				if(state >= arrImg.size()) state=0;
				repaint();
			}//if arr is null
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}
	
	private void plot(Graphics g, int x, int y, int intColor) {
		g.setColor(new Color(intColor));
		g.drawLine(x, y, x, y);		//draw pixel
	}
}

MyImage.java

package CG;

import java.awt.Image;
import java.awt.image.PixelGrabber;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import javax.activation.MimetypesFileTypeMap;
import javax.imageio.ImageIO;

public class MyImage {
	private File imgFile = null;
	private Image img = null;
	
	public MyImage(File imgFile) throws IOException{		
		this.imgFile = imgFile;
		img = ImageIO.read(imgFile);	
	}
	
	public static boolean isImage(File f) {
		String mimetype= new MimetypesFileTypeMap().getContentType(f);
        String type = mimetype.split("/")[0];
        return type.equals("image");
	}
	
	public int getWidth() {
		return img.getWidth(null);
	}
	
	public int getHeight() {
		return img.getHeight(null);
	}
	
	 public int[] toArray(){
		  int[] pixel = null;
		  
	      try {
	    	  PixelGrabber grabber = new PixelGrabber(img, 0, 0, getWidth(), getHeight(), true);
		      if (grabber.grabPixels()) {
		    	  pixel = (int[]) grabber.getPixels();            
		      }
		      writeLog(pixel);
	      } catch (InterruptedException e) {
	    	  e.printStackTrace();
	      }
	      
	      return pixel;
	  }
	 
	 private void writeLog(int[] arr) {
		 /*
		  * Log file index of first[0] and second[1] is image size -- first[0] value is image width and
		  * second[1] value is image height, other value is color integer value
		  * Tokens by " " (blank). There are values totally = width*height.
		  */
		 
		 try{
		 	String filenameSave = imgFile.getAbsolutePath()+".txt";
		    PrintWriter writer = new PrintWriter(filenameSave, "UTF-8");
		    int pixelLength = arr.length;
		    
		    //writer
		    writer.print(getWidth());		//first[0] write image width
		    writer.print(" "+getHeight());	//second[1] write image height
		    
		    for(int i=0; i<pixelLength; i++) {
		    	writer.print(" "+arr[i]);
		    }
		    writer.close();
		    System.out.println("Save file: "+filenameSave);
		} catch (IOException e) {
			System.err.println(e.getMessage());
		}
	 }
}

On image folder -- include all images in the same folder

Result image -- output

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Source image file

https://78.media.tumblr.com/f15ea99b3a02831363c06726d2640fed/tumblr_mrw2kmWOJF1qhl91yo1_500.gif