private void FadeYPbPr(string postfix)
{
ColorYPbPr[,] gray_pixels = new ColorYPbPr[H, W];
Array.Copy(pixel_colors, gray_pixels, H * W);
for (int i = 0; i < MAX_STEPS; i++)
{
bool bChanged = FadeYPbPr(ref gray_pixels);
if (!bChanged)
{
break;
}
string file_name = String.Format("{0,4:D4}", i) + postfix;
Color[,] rgb_gray = new Color[H, W];
for (int j = 0; j < H; j++)
{
for (int k = 0; k < W; k++)
{
rgb_gray[j, k] = gray_pixels[j, k].ToRGB();
}
}
SaveToImage(rgb_gray, file_name);
}
}
public void SetYPbPrFromRGB(int h, int w, int r, int g, int b)
{
Color clr = Color.FromArgb(255, r, g, b);
ColorYPbPr color = new ColorYPbPr(clr);
pixel_colors[h, w] = color;
}
private bool FadeYPbPr(ref ColorYPbPr[,] gray_pixels)
{
//slowly adjust the Pb & Pr values towards 0.0
//linear shift each value by .200 until it's 0 or it jumps to the opposite sign and then clamp it at 0
bool changed = false;
for (int i = 0; i < H; i++)
{
for (int j = 0; j < W; j++)
{
ColorYPbPr shifted = gray_pixels[i, j];
if (shifted.Pb < 0.0)
{
changed = true;
shifted.Pb += .200;
if (shifted.Pb > 0)
{
shifted.Pb = 0;
}
}
else if (shifted.Pb > 0.0)
{
changed = true;
shifted.Pb -= .200;
if (shifted.Pb < 0)
{
shifted.Pb = 0;
}
}
if (shifted.Pr < 0.0)
{
changed = true;
shifted.Pr += .200;
if (shifted.Pr > 0)
{
shifted.Pr = 0;
}
}
else if (shifted.Pr > 0.0)
{
changed = true;
shifted.Pr -= .200;
if (shifted.Pr < 0)
{
shifted.Pr = 0;
}
}
}
}
return(changed);
}