A quick way to map a value to a color by using one of the methods in Color class.

For example, using Color.HSVToColor and passing your value in as the “hue” will give you a rainbow color palette. The appropriate mapping will depend on what range the values in your matrix can take. If they are in the range -1 to +1, this will work for you:

float hue = (float) (matrix[i][j] + 1) * 180;
float[] hsv = { hue, 1f, 1f };
int color = Color.HSVToColor(hsv);

I’m working with an image in android studio. To make it simple let’s say it only has 9 pixels. The values of the pixel are held in a double matrix in, lets say its something I like this:

double[][] matrix = {{-0.5, -0.4, -0.3},
                     {-0.1, -0.9, -0.4},
                     {-0.5, -0.6, -0.9}}

I want to turn each of those doubles into a color int so I can put them into an image pixel by pixel. (In Matlab you’d use something like colormap('jet')).

Bitmap bitmap = Bitmap.createBitmap(length, height, Bitmap.Config.RGB_565);
                for(int i = 0; i< length ; i++ ){
                    for (int j = 0; j < height; j++){
                        //Convert number in matrix to color from blue to red
                        int color;

                        //Make correlating pixel that color
                        bitmap.setPixel(i,j, color);
                    }
                }

I have tried using the Scichart SDK but the license is too expensive.
I also tried the Mines package but it depends on Java AWT which is not available in android studio

I can’t find anything on the documentation.