public static bool HistoStretch(ref Bitmap graybmp, params double[] limit)
{
if (graybmp.PixelFormat != PixelFormat.Format8bppIndexed)
return false;
int w = graybmp.Width;
int h = graybmp.Height;
double stretchfactor = 1.00;
int threshold = (int)(w * h * 0.015);
if (limit.Length != 0) threshold = (int)(w * h * limit[0] / 100);
int[] hist = new int[256];
BmpProc8 src = new BmpProc8(graybmp);
for (int y = 0; y < h; y++)
for (int x = 0; x < w; x++)
hist[src[x, y]]++;
int lt = 0;
for (int i = 0; i < 256; i++)
{
lt += hist[i];
if (lt > threshold)
{
lt = i;
break;
}
}
int ht = 0;
for (int i = 255; i >= 0; i--)
{
ht += hist[i];
if (ht > threshold)
{
ht = i;
break;
}
}
double originalrange = ht - lt + 1;
double stretchedrange = originalrange + stretchfactor * (255 - originalrange);
double scalefactor = stretchedrange / originalrange;
for (int i = 0; i < 256; i++)
hist[i] = AdjustByte(scalefactor * (i - lt));
for (int y = 0; y < h; y++)
for (int x = 0; x < w; x++)
src[x, y] = (byte)hist[src[x, y]];
src.Dispose();
return true;
}
public static bool PaletteHistogram(Bitmap bmp, out Bitmap bmpHist)
{
if (bmp.PixelFormat != PixelFormat.Format8bppIndexed)
{
bmpHist = null;
return false;
}
int w = bmp.Width;
int h = bmp.Height;
int[] hist = new int[256];
BmpProc8 bd = new BmpProc8(bmp);
for (int y = 0; y < h; y++)
for (int x = 0; x < w; x++)
hist[bd[x, y]]++;
bd.Dispose();
int max = -1;
for (int i = 0; i < 256; i++)
if (hist[i] > max) max = hist[i];
for (int i = 0; i < 256; i++)
hist[i] = hist[i] * 140 / max;
bmpHist = new Bitmap(275, 180, PixelFormat.Format24bppRgb);
Graphics g = Graphics.FromImage(bmpHist);
g.Clear(Color.AntiqueWhite);
Pen pen = new Pen(Color.Gray, 1F);
for (int i = 0; i < 256; i++)
g.DrawLine(pen, 10 + i, 150, 10 + i, 150 - hist[i]);
pen.Color = Color.Black;
g.DrawLine(pen, 8, 150, 8, 10);
for (int i = 0; i <= 20; i++)
if ((i % 2) == 0)
g.DrawLine(pen, 8, 150 - 7 * i, 4, 150 - 7 * i);
else
g.DrawLine(pen, 8, 150 - 7 * i, 6, 150 - 7 * i);
g.DrawLine(pen, 10, 150, 10 + 255, 150);
for (int i = 0; i <= 51; i++)
if ((i % 2) == 0)
g.DrawLine(pen, 10 + 5 * i, 150, 10 + 5 * i, 154);
else
g.DrawLine(pen, 10 + 5 * i, 150, 10 + 5 * i, 152);
ColorPalette pal = bmp.Palette;
for (int i = 0; i < 256; i++)
{
pen.Color = pal.Entries[i];
g.DrawLine(pen, 10 + i, 175, 10 + i, 158);
}
g.Dispose();
return true;
}
public static bool Invert8(ref Bitmap bmp)
{
if (bmp.PixelFormat != PixelFormat.Format8bppIndexed)
return false;
int w = bmp.Width;
int h = bmp.Height;
BmpProc8 src = new BmpProc8(bmp);
for (int y = 0; y < h; y++)
for (int x = 0; x < w; x++)
src[x, y] = (byte)(255 - src[x, y]);
src.Dispose();
return true;
}
public static bool Diacross(ref Bitmap bmp, bool bFine,
Color penColor, Color bkColor)
{
if (bmp.PixelFormat != PixelFormat.Format24bppRgb)
return false;
int w = bmp.Width;
int h = bmp.Height;
Graphics g;
GrayScale(ref bmp);
HistoStretch(ref bmp);
Bitmap[] pattern = new Bitmap[4];
TextureBrush[] tb = new TextureBrush[4];
if (bFine)
{
Pen pn = new Pen(penColor, 1.8f);
pn.Alignment = PenAlignment.Center;
PointF[] start = { new PointF(0f, 0.5f), new PointF(0.5f, 0F),
new PointF(0f, 2.5f), new PointF(2.5f, 0f) };
PointF[] stop = { new PointF(4f, 0.5f), new PointF(0.5f, 4f),
new PointF(4f, 2.5f), new PointF(2.5f, 4f) };
float[] angle = { -37f, -53f };
for (int i = 0; i < 4; i++)
{
pattern[i] = new Bitmap(4, 4, PixelFormat.Format24bppRgb);
g = Graphics.FromImage(pattern[i]);
g.Clear(Color.White);
g.DrawLine(pn, start[i], stop[i]);
g.Dispose();
tb[i] = MakePatternBrush(pattern[i], angle[i % 2]);
}
pn.Dispose();
}
else
{
Pen pn = new Pen(penColor, 2.2f);
pn.Alignment = PenAlignment.Center;
Point[] start = { new Point(0, 1), new Point(1, 0),
new Point(0, 4), new Point(4, 0) };
Point[] stop = { new Point(9, 1), new Point(1, 9),
new Point(9, 4), new Point(4, 9) };
float[] angle = { -30f, -60f };
for (int i = 0; i < 4; i++)
{
pattern[i] = new Bitmap(6, 6, PixelFormat.Format32bppArgb);
g = Graphics.FromImage(pattern[i]);
g.Clear(Color.White);
g.DrawLine(pn, start[i], stop[i]);
g.Dispose();
tb[i] = MakePatternBrush(pattern[i], angle[i % 2]);
}
pn.Dispose();
}
Bitmap dst = new Bitmap(w, h, PixelFormat.Format24bppRgb);
Graphics gdst = Graphics.FromImage(dst);
gdst.Clear(bkColor);
byte[] th = { 255, 191, 128, 64 };
Bitmap tgt;
BmpProc8 mod = new BmpProc8(bmp);
for (int i = 0; i < 4; i++)
{
tgt = new Bitmap(w, h, PixelFormat.Format32bppArgb);
g = Graphics.FromImage(tgt);
g.FillRectangle(tb[i], 0, 0, w, h);
g.Dispose();
tb[i].Dispose();
pattern[i].Dispose();
BmpProc32 src = new BmpProc32(tgt);
for (int y = 0; y < h; y++)
for (int x = 0; x < w; x++)
{
if (mod[x, y] < th[i])
src[x, y, eRGB.a] =
AdjustByte((double)(255 - src[x, y, eRGB.r]) *
((1d - ((double)mod[x, y] / (double)th[i]))));
else
src[x, y, eRGB.a] = 0;
}
src.Dispose();
gdst.DrawImageUnscaled(tgt, 0, 0);
tgt.Dispose();
}
mod.Dispose();
bmp.Dispose();
gdst.Dispose();
bmp = dst;
return true;
}
public static bool GrayScale8(ref Bitmap bmp8)
{
if (bmp8.PixelFormat != PixelFormat.Format8bppIndexed)
return false;
int w = bmp8.Width;
int h = bmp8.Height;
ColorPalette pal = bmp8.Palette;
byte[] cl = new byte[pal.Entries.Length];
Color c;
for (int i = 0; i < pal.Entries.Length; i++)
{
c = pal.Entries[i];
cl[i] = (byte)(c.R * 0.299 + c.G * 0.587 + c.B * 0.114);
}
BmpProc8 bd = new BmpProc8(bmp8);
for (int y = 0; y < h; y++)
for (int x = 0; x < w; x++)
bd[x, y] = cl[bd[x, y]];
bd.Dispose();
return SetGrayPalette(bmp8);
}
public static bool Oscillo(ref Bitmap bmp, int width, bool bHorizontal,
Color dark, Color bright)
{
if (bmp.PixelFormat != PixelFormat.Format24bppRgb)
return false;
if ((width < 2) | (width > 10)) return false;
int w = bmp.Width;
int h = bmp.Height;
int interval = width * 2 + 1;
double sum;
int count;
Bitmap tmp = bmp.Clone() as Bitmap;
GrayScale(ref tmp);
HistoStretch(ref tmp);
Pen pn = new Pen(Color.Black, 1.0f);
Graphics g = Graphics.FromImage(bmp);
g.Clear(Color.White);
g.SmoothingMode = SmoothingMode.AntiAlias;
BmpProc8 src = new BmpProc8(tmp);
if (bHorizontal)
for (int y = width; y < h + width; y += interval)
for (int x = 0; x < w; x++)
{
sum = 0; count = 0;
for (int iy = y - width; iy <= y + width; iy++)
{
if (iy > h - 1) break;
count++;
sum += 255 - src[x, iy];
}
sum = sum * width / (count * 255d);
sum = Math.Max(0.1d, sum);
g.DrawLine(pn, (float)x, (float)(y + sum),
(float)x, (float)(y - sum));
}
else
for (int x = width; x < w + width; x += interval)
for (int y = 0; y < h; y++)
{
sum = 0; count = 0;
for (int ix = x - width; ix <= x + width; ix++)
{
if (ix > w - 1) break;
count++;
sum += 255 - src[ix, y];
}
sum = sum * width / (count * 255d);
sum = Math.Max(0.1d, sum);
g.DrawLine(pn, (float)(x - sum), (float)y,
(float)(x + sum), (float)y);
}
src.Dispose();
g.Dispose();
GrayScale(ref bmp);
SetTwoColorGrayPalette(bmp, dark, bright);
return true;
}