How to create a custom colormap in Java using OpenCV?

The

Imgproc class's applyColorMap() method applies the specified color map to the given image. This method accepts three parameters -

• Two Mat objects representing the source image and the target image.

An integer variable representing the type of colormap to apply.

You can pass any of the following values ​​to this method as a colormap value.

COLORMAP_AUTUMN、COLORMAP_BONE、COLORMAP_COOL、COLORMAP_HOT、 COLORMAP_HSV, COLORMAP_JET, COLORMAP_OCEAN, COLORMAP_PARULA, COLORMAP_PINK, COLORMAP_RAINBOW, COLORMAP_SPRING, COLORMAP_SUMMER, COLORMAP_WINTER.

Example

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;
public class CustomColorMaps {
   public static void main(String args[]) {
      // Loading the OpenCV core library
      System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
      // Reading the Image from the file and storing it in to a Matrix object
      String file ="D:\images\cat.jpg";
      Mat src = Imgcodecs.imread(file);
      // Creating an empty matrix to store the result
      Mat dst = new Mat();
      // Applying color map to an image
      Imgproc.applyColorMap(src, dst, Imgproc. COLORMAP_PINK);
      // Writing the image
      Imgcodecs.imwrite("D:\images\color_map.jpg", dst);
      System.out.println("Image processed");
   }
}

Input picture

Output

When executed, the above program generates the following output-

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