Use a color to create a gradient

TextureGradient.pde

class TextureGradient {
  public color[] pixels;
  
  TextureGradient(String name) {
    PImage background = loadImage(name);
    background.loadPixels();
    pixels = background.pixels;
  }
  
  color get(float t) {
    int currentMode = g.colorMode;
    colorMode(RGB);
    t*=pixels.length;
    color tMin = pixels[max(min(int(t),pixels.length-1),0)];
    color tMax = pixels[min(int(t+1),pixels.length-1)];
    color result = lerpColor(tMin, tMax, t%1);
    colorMode(currentMode);
    return result;
  }
  
  color getLinear(float t) {
    t*=backgroundColors.length;
    return pixels[max(min(int(t),pixels.length-1),0)];
  }
}