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Thread: buffered image to RGB array

  1. #1
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    Default buffered image to RGB array

    My final goal is to import a JPEG image and convert it into an array that follows an RGB format. The array I want the image to go to is image[2][height][width]. Where image[0][height][width] is the red color scale from 0 to 255, image[1][height][width] is the green color scale from 0 to 255 and image[2][height][width] is the blue color scale from 0 to 255.

    Below is the code I have so far. Basically, I can import an image to the "buffered" image, and I can write an image to a PNG file from an array of my choosing (in this case the array named "image") that follows the RGB format. But I can't convert the buffered image to an array. Does anyone know the missing code I need?

    Thanks!

    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
     
    import javax.imageio.ImageIO;
     
     
    public class test {
     
    	//counters
    	int version = 100;
    	int imageVersion = 100;
     
    	//instantiate variables for dimensions of image array to be created
    	int height;
    	int width; 
    	int depth = 2;
     
    	public static void main (String[] args) { 
     
    	       new test();
     
    	} 
     
    	public test(){
     
    		//reads a jpeg image from a specified file path and writes it to a specified array
    	       File e = new File( "C:/Users/jclarine/Documents/Courses/CLU Classes/Computer Graphics/Week 6/Images/readImage.jpg" );
    	       BufferedImage bi;
    		try {
    			bi = ImageIO.read(e);
    			width = bi.getWidth();
    			height = bi.getHeight();
    		} catch (IOException e1) {
    			// TODO Auto-generated catch block
    			e1.printStackTrace();
    		}
     
    		//final image array for output of fireworks
    		int image[][][] = new int[depth][height][width];
     
     
            for (int i = 0; i < height; ++i) {
            	for (int j = 0; j < width; ++j) {
            		for (int k = 0; k < depth; ++k) {
     
            			//what do i put here to write the buffered image into the array named "image" that follows an RGB format.
     
            		}       		
            	}
            }
     
            createPNG(image);
     
    	}
     
     
    	//Method to write array to an image file
    	public void createPNG (int[][][] imagePNG) {
     
     
    		// -- write image to file
    		//System.out.println("writing to file");
    	    try {
    	    	// -- move image into BufferedImage object
    	        BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    	        for (int i = 0; i < height; ++i) {
    	        	for (int j = 0; j < width; ++j) {
    	        		int pixel = (imagePNG[0][i][j] << 16) | (imagePNG[1][i][j] << 8) | (imagePNG[2][i][j]);
    	        		bi.setRGB(j, i, pixel);
    	        	}
    	        }
    	        File outputfile = new File("C:/Users/jclarine/Documents/Courses/CLU Classes/Computer Graphics/Week 6/Images/randomcolors_"+imageVersion+".png");
    	        ImageIO.write(bi, "png", outputfile);
    	    } catch (IOException e) {
    	        System.out.println("image write error");
    	    }
     
    		//System.out.println("done");
     
    		++imageVersion;
     
    	}
     
    }


  2. #2
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    Default Re: buffered image to RGB array

    See the following link to the API, in particular the getRGB method
    BufferedImage (Java Platform SE 6)

  3. #3
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    Default Re: buffered image to RGB array

    getRGB worked! Thanks...

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