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// 0xRRGGBB
static int rawRGBDiff(int a, int b) {
int r1 = (a >> 16) & 0xFF;
int g1 = (a >> 8) & 0xFF;
int b1 = a & 0xFF;
int r2 = (b >> 16) & 0xFF;
int g2 = (b >> 8) & 0xFF;
int b2 = b & 0xFF;
ret Math.abs(r1-r2) + Math.abs(g1-g2) + Math.abs(b1-b2);
}