public void StretchHistogram()
{
CreateHistogram();
int newR;
int newG;
int newB;
int diffR = maxR - minR;
int diffG = maxG - minG;
int diffB = maxB - minB;
try
{
bitmapData = BasicImageOpertions.BitmapToBitmapData(bitmap);
int bytesPerPixel = System.Drawing.Bitmap.GetPixelFormatSize(bitmap.PixelFormat) / 8;
int heightInPixels = bitmapData.Height;
int widthInBytes = bitmapData.Width * bytesPerPixel;
unsafe // C# doesn't support pointer arithmetic
{
byte *PtrFirstPixel = (byte *)bitmapData.Scan0; // Point to first pixel
for (int y = 0; y < heightInPixels; y++)
{
byte *currentLine = PtrFirstPixel + (y * bitmapData.Stride);
for (int x = 0; x < widthInBytes; x += bytesPerPixel)
{
newR = (int)((currentLine[x + 2] - minR) * 255 / diffR);
newG = (int)((currentLine[x + 1] - minG) * 255 / diffG);
newB = (int)((currentLine[x] - minB) * 255 / diffB);
currentLine[x + 2] = (byte)newR;
currentLine[x + 1] = (byte)newG;
currentLine[x] = (byte)newB;
}
}
bitmap.UnlockBits(bitmapData);
}
}
catch
{
System.Windows.Forms.MessageBox.Show("Please select image first", "Error");
}
caller.SetImageAndHist(bitmap);
}
private void btnAccept_Click(object sender, EventArgs e)
{
caller.SetImageAndHist(output);
this.Close();
}
private void btnOK_Click(object sender, EventArgs e)
{
originalImage = ChangeImage(originalImage);
caller.SetImageAndHist(originalImage);
this.Dispose();
}