lurbas

public ColorFilter duotoneColorFilter(@ColorInt int colorBlack, @ColorInt int colorWhite, float contrast) {
    ColorMatrix cm = new ColorMatrix();
    
    ColorMatrix cmBlackWhite = new ColorMatrix();
    float lumR = 0.2125f;
    float lumG = 0.7154f;
    float lumB = 0.0721f;
    float[] blackWhiteArray = new float[]{
                lumR, lumG, lumB, 0, 0,
                lumR, lumG, lumB, 0, 0,