CODEWITHSUNDEEP
java
GltknBtn
GltknBtn

Reputation: 512

How to get an image's rgb matrix separately?

I have an image database and I want to store these image's RGB matrix in mysql db separately (Forexample : redMatrix_column, greenMatrix_column, blueMatrix_column ). In matlab I can get RBG matrix separately using imread() function. How to do this in java ? thanks for your help.

Upvotes: 4

Views: 2115

Answers (1)

Raffaele
Raffaele

Reputation: 20875

This is how you get the color components:

public class GetImageColorComponents {
  public static void main(String... args) throws Exception {
    BufferedImage img = ImageIO.read(GetImageColorComponents.class
                                     .getResourceAsStream("/image.png"));
    int[] colors = new int[img.getWidth() * img.getHeight()];
    img.getRGB(0, 0, img.getWidth(), img.getHeight(), colors, 0, img.getWidth());

    int[] red = new int[colors.length];
    int[] green = new int[colors.length];
    int[] blue = new int[colors.length];

    for (int i = 0; i < colors.length; i++) {
      Color color = new Color(colors[i]);
      red[i] = color.getRed();
      green[i] = color.getGreen();
      blue[i] = color.getBlue();
    }
  }
}

See this gist for a complete example involving saving and retrieving the bytes in the MySQL database.

Upvotes: 6

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