Java: Get color from a solid image

gistfile1.java

Color getImageColor(File imagePath) {
    BufferedImage image = ImageIO.read(imagePath);
    int color = image.getRGB(0, 0);
    for (int r = 0; r < image.getHeight(); r += 1) {
        for (int c = 0; c < image.getWidth(); c += 1) {
            if (image.getRGB(c, r) != color) {
                throw new IllegalArgumentException("Image: " + imagePath + " is not a solid color.");
            }
        }
    }

    return new Color(color);
}