FOR y = 0 to (HEIGHT - 1)

                                           FOR x = 0 to (WIDTH - 1)

                                               ARRAY2D[ x ][ y ] = ARRAY1D[(WIDTH * y) + x]

                                           END

                                     END


                                     Conversion from a 1D array to a 2D array (for MATLAB where indices start from 1)

                                     FOR y = 1 to HEIGHT

                                           FOR x = 1 to WIDTH

                                               ARRAY2D[ x ][ y ] = ARRAY1D[(WIDTH * (y - 1)) + x]

                                           END

                                     END

                                     OR

                                     ARRAY2D = reshape(ARRAY1D, WIDTH, HEIGHT);

                                     Similarly, to convert a 2D array into a 1D array you can do:

                                     ARRAY1D = reshape(ARRAY2D, 1, WIDTH * HEIGHT);

                                     where, WIDTH = width of 2D array; HEIGHT = height of 2D array.



                                     Extracting r, g, b components from an integer color at (i, j) of a BufferedImage (bImg) in Java

                                     int value1 = bImg.getRGB(i,j);

                                     int r1 = (value1 >> 16) & 0xff;

                                     int g1 = (value1 >> 8) & 0xff;

                                     int b1 = (value1 >> 0) & 0xff;

                                     Combining r, g, b components to get a single integer value

                                     int alpha = 255;

                                     int value = (alpha << 24) | (r << 16) | (g << 8) | b;