public void CollectData(IBitmapCore image)
{
double light_max = 0;
for (int i = 0; i < image.Width; i++)
for (int j = 0; j < image.Height; j++)
{
double light = Math.Sqrt(image.RedChannel[i, j] * image.RedChannel[i, j] +
image.GreenChannel[i, j] * image.GreenChannel[i, j] +
image.BlueChannel[i, j] * image.BlueChannel[i, j]) / Math.Sqrt(3);
int light_inx = (int)(light / mMaxLight * mLines);
if (light_inx >= mLines) light_inx = mLines - 1;
mLightHistogramData[light_inx] += 1;
if (mLightHistogramData[light_inx] > light_max)
light_max = mLightHistogramData[light_inx];
int red_inx = (int)(image.RedChannel[i, j] / mMaxLight * mLines);
if (red_inx >= mLines) red_inx = mLines - 1;
mRedHistogramData[red_inx] += 1;
int green_inx = (int)(image.GreenChannel[i, j] / mMaxLight * mLines);
if (green_inx >= mLines) green_inx = mLines - 1;
mGreenHistogramData[green_inx] += 1;
int blue_inx = (int)(image.BlueChannel[i, j] / mMaxLight * mLines);
if (blue_inx >= mLines) blue_inx = mLines - 1;
mBlueHistogramData[blue_inx] += 1;
}
for (int i = 0; i < mLines; i++)
{
mLightHistogramData[i] /= light_max;
mRedHistogramData[i] /= light_max;
mGreenHistogramData[i] /= light_max;
mBlueHistogramData[i] /= light_max;
}
}
public void CutHighlights(double cut, double softness, int lines, double tailValueAtLeast, ProgressReporter callback) { double maxlight = CalcMaxLight(); HistogramCollector sc = new HistogramCollector(maxlight, lines); sc.CollectData(this); double red_tail = sc.LineToScale(sc.FindHighTailRed(tailValueAtLeast)); double green_tail = sc.LineToScale(sc.FindHighTailGreen(tailValueAtLeast)); double blue_tail = sc.LineToScale(sc.FindHighTailBlue(tailValueAtLeast)); double min_tail = Math.Min(red_tail, Math.Min(green_tail, blue_tail)); double max_tail = Math.Max(red_tail, Math.Max(green_tail, blue_tail)); // Building highlights matrix double delta = softness; // Highlight distance double alpha = Math.Log(2) / delta; double q = min_tail + cut * (max_tail - min_tail); for (int j = 0; j < mHeight; j++) { if (j % REPORT_EVERY_NTH_LINE == 0 && callback != null) { if (!callback((double)j / mHeight)) throw new UserCancelException(); } for (int i = 0; i < mWidth; i++) { if (r_chan[i, j] > q) r_chan[i, j] = (float)q; if (g_chan[i, j] > q) g_chan[i, j] = (float)q; if (b_chan[i, j] > q) b_chan[i, j] = (float)q; double x = Math.Sqrt(r_chan[i, j] * r_chan[i, j] + g_chan[i, j] * g_chan[i, j] + b_chan[i, j] * b_chan[i, j]) / Math.Sqrt(3) / q; double beta = Math.Log(q) - alpha; hl_chan[i, j] = (float)((Math.Exp(alpha * x + beta) - Math.Exp(beta)) / (Math.Exp(alpha + beta) - Math.Exp(beta))); } } }