I've made two functions for image processing:

1. First one is for rotating an image
2. Second one is to set all pixels of one color to another color

Rotate Image:

private static void roateImage(BufferedImage pic1) throws IOException {
    int width = pic1.getWidth(null);
    int height = pic1.getHeight(null);

    double angle = Math.toRadians(90);
    double sin = Math.sin(angle);
    double cos = Math.cos(angle);
    double x0 = 0.5 * (width - 1);     // point to rotate about
    double y0 = 0.5 * (height - 1);     // center of image

    WritableRaster inRaster = pic1.getRaster();
    BufferedImage pic2 = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    WritableRaster outRaster = pic2.getRaster();
    int[] pixel = new int[3];

    // rotation
    for (int x = 0; x < width; x++) {
        for (int y = 0; y < height; y++) {
            double a = x - x0;
            double b = y - y0;
            int xx = (int) (+a * cos - b * sin + x0);
            int yy = (int) (+a * sin + b * cos + y0);

            if (xx >= 0 && xx < width && yy >= 0 && yy < height) {
                outRaster.setPixel(x, y, inRaster.getPixel(xx, yy, pixel));
            }
        }
    }
    ImageIO.write(pic2, "bmp", new File("Images/Output2.bmp"));
}

Please help me to optimize this code.

I've made two functions for image processing:

1. First one is for rotating an image
2. Second one is to set all pixels of one color to another color

Rotate Image:

private static void roateImage(BufferedImage pic1) throws IOException {
    int width = pic1.getWidth(null);
    int height = pic1.getHeight(null);

    double angle = Math.toRadians(90);
    double sin = Math.sin(angle);
    double cos = Math.cos(angle);
    double x0 = 0.5 * (width - 1);     // point to rotate about
    double y0 = 0.5 * (height - 1);     // center of image

    WritableRaster inRaster = pic1.getRaster();
    BufferedImage pic2 = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    WritableRaster outRaster = pic2.getRaster();
    int[] pixel = new int[3];

    // rotation
    for (int x = 0; x < width; x++) {
        for (int y = 0; y < height; y++) {
            double a = x - x0;
            double b = y - y0;
            int xx = (int) (+a * cos - b * sin + x0);
            int yy = (int) (+a * sin + b * cos + y0);

            if (xx >= 0 && xx < width && yy >= 0 && yy < height) {
                outRaster.setPixel(x, y, inRaster.getPixel(xx, yy, pixel));
            }
        }
    }
    ImageIO.write(pic2, "bmp", new File("Images/Output2.bmp"));
}

Please help me to optimize this code.

Change color of pixels:

 private static void setPixelColor(BufferedImage imgBuf, int red, int green, int blue, int newRed, int newGreen, int newBlue) throws IOException {
    int[] RGBarray;
    int w;
    int h;

    //Declare color arrays
    int[][] alphaPixels;
    int[][] redPixels;
    int[][] greenPixels;
    int[][] bluePixels;

    w = imgBuf.getWidth();
    h = imgBuf.getHeight();


    alphaPixels = new int[h][w];
    redPixels = new int[h][w];
    greenPixels = new int[h][w];
    bluePixels = new int[h][w];

    RGBarray = imgBuf.getRGB(0, 0, w, h, null, 0, w);

    //Bit shift values into arrays
    int i = 0;
    for (int row = 0; row < h; row++) {
        for (int col = 0; col < w; col++) {
            alphaPixels[row][col] = ((RGBarray[i] >> 24) & 0xff);
            redPixels[row][col] = ((RGBarray[i] >> 16) & 0xff);
            greenPixels[row][col] = ((RGBarray[i] >> 8) & 0xff);
            bluePixels[row][col] = (RGBarray[i] & 0xff);
            i++;
        }
    }

    //Set the values back to integers using re-bit shifting
    for (int row = 0; row < h; row++) {
        for (int col = 0; col < w; col++) {
            if (redPixels[row][col] == red && greenPixels[row][col] == green && bluePixels[row][col] == blue) {
                int rgb = (alphaPixels[row][col] & 0xff) << 24 |
                        (redPixels[row][col] & newRed) << 16 |
                        (greenPixels[row][col] & newGreen) << 8 |
                        (bluePixels[row][col] & newBlue);
                imgBuf.setRGB(col, row, rgb);
            }
        }
    }

    //Write back image
    ImageIO.write(imgBuf, "bmp", new File("Images/Output2.bmp"));
}

Please help me to optimize this code.

Please help me to optimize this code.

I've made 2 function for image processing:

1. First one is for rotate an image
2. Second it's to change the color of all pixels with one color

Please help me to optimize this code how much you can if it's possible because I need to optimize this as much is possible. I will be glad for any kind of help.

Thanks.

I've made two functions for image processing:

1. First one is for rotating an image
2. Second one is to set all pixels of one color to another color

Please help me to optimize this code.