@Override
protected int[] filterPixels(int width, int height, int[] inPixels, Rect transformedSpace) {
Histogram histogram = new Histogram(inPixels, width, height, 0, width);
int i, j;
if (histogram.getNumSamples() > 0) {
lut = new int[3][256];
float low = lowLevel * 255;
float high = highLevel * 255;
if (low == high) high++;
for (i = 0; i < 3; i++) {
for (j = 0; j < 256; j++)
lut[i][j] =
PixelUtils.clamp(
(int)
(255
* (lowOutputLevel
+ (highOutputLevel - lowOutputLevel) * (j - low) / (high - low))));
}
} else lut = null;
i = 0;
for (int y = 0; y < height; y++)
for (int x = 0; x < width; x++) {
inPixels[i] = filterRGB(x, y, inPixels[i]);
i++;
}
lut = null;
return inPixels;
}
