docs: public void setKernel(float[] values, float colorAdj) {
          if (values.length != KERNEL_SIZE) {
              throw new IllegalArgumentException("Kernel size is " + values.length +
                      " vs. " + KERNEL_SIZE);
          }
          System.arraycopy(values, 0, mKernel, 0, KERNEL_SIZE);
          mColorAdjust = colorAdj;
          //Log.d(TAG, "filt kernel: " + Arrays.toString(mKernel) + ", adj=" + colorAdj);
      }