static int binaryImagePixelDifference_sameSize(Image2B img1, Image2B img2) {
  assertSameSize(img1, img2);
  ret countDifferingBits(img1.pixels, img2.pixels);
}

static int binaryImagePixelDifference_sameSize(Image2BAsInts img1, Image2BAsInts img2) {
  assertSameSize(img1, img2);
  ret countDifferingBits(img1.pixels, img2.pixels);
}

static int binaryImagePixelDifference_sameSize(Image2BAsLongs img1, Image2BAsLongs img2) {
  assertSameSize(img1, img2);
  ret countDifferingBits(img1.pixels, img2.pixels);
}