/// <summary>
/// (see http://stackoverflow.com/questions/16346212/can-you-change-one-colour-to-another-in-an-bitmap-image
/// and https://msdn.microsoft.com/en-GB/library/ms229672%28v=vs.90%29.aspx)
/// </summary>
/// <param name="bmp"></param>
/// <param name="inColourR"></param>
/// <param name="inColourG"></param>
/// <param name="inColourB"></param>
/// <param name="outColourR"></param>
/// <param name="outColourG"></param>
/// <param name="outColourB"></param>
internal unsafe static Bitmap changeColour(this Bitmap original, Color oldColor, Color newColor, int Tolerance = 0,enPixelCompare CompareType = enPixelCompare.pc_RGB_all)
{
byte inColourR_max, inColourG_max, inColourB_max;
byte inColourR_min, inColourG_min, inColourB_min;
byte outColourR, outColourG, outColourB;
int tempValue;
//create a clone of the original
Bitmap newBitmap = (Bitmap)original.Clone();
tempValue = (int)oldColor.R + Tolerance;
inColourR_max = (tempValue > 255) ? (byte)255 : (byte)tempValue ;
tempValue = (int)oldColor.G + Tolerance;
inColourG_max = (tempValue > 255) ? (byte)255 : (byte)tempValue ;
tempValue = (int)oldColor.B + Tolerance;
inColourB_max = (tempValue > 255) ? (byte)255 : (byte)tempValue ;
tempValue = (int)oldColor.R - Tolerance;
inColourR_min = (tempValue < 0) ? (byte)0 : (byte)tempValue ;
tempValue = (int)oldColor.G - Tolerance;
inColourG_min = (tempValue < 0) ? (byte)0: (byte)tempValue ;
tempValue = (int)oldColor.B - Tolerance;
inColourB_min = (tempValue < 0) ? (byte)0 : (byte)tempValue ;
outColourR = newColor.R;
outColourG = newColor.G;
outColourB = newColor.B;
// Specify a pixel format.
PixelFormat pxf = original.PixelFormat;
// Lock the bitmap's bits.
Rectangle rect = new Rectangle(0, 0, newBitmap.Width, newBitmap.Height);
BitmapData bmpData = newBitmap.LockBits(rect, ImageLockMode.ReadWrite, pxf);
// Get the address of the first line.
IntPtr ptr = bmpData.Scan0;
// Declare an array to hold the bytes of the bitmap.
// int numBytes = newBitmap.Width * newBitmap.Height * 3;
int numBytes = bmpData.Stride * newBitmap.Height;
byte[] rgbValues = new byte[numBytes];
// Copy the RGB values into the array.
Marshal.Copy(ptr, rgbValues, 0, numBytes);
double newColorBrightness = (double)(newColor.R+newColor.R+newColor.B+newColor.G+newColor.G+newColor.G)/6.0;
// Manipulate the bitmap
for (int line = 0; line < bmpData.Height ; line += 1)
{
for (int pixel = 0; (pixel+3) < bmpData.Stride ; pixel += 3)
{
int currentPixel = line * bmpData.Stride + pixel;
switch (CompareType)
{
case enPixelCompare.pc_RGB_all:
if (((rgbValues[currentPixel] >= inColourB_min) && (rgbValues[currentPixel] <= inColourB_max)) &&
((rgbValues[currentPixel + 1] >= inColourG_min) && (rgbValues[currentPixel + 1] <= inColourG_max)) &&
((rgbValues[currentPixel + 2] >= inColourR_min) && (rgbValues[currentPixel + 2] <= inColourR_max)))
{
rgbValues[currentPixel] = outColourB;
rgbValues[currentPixel + 1] = outColourG;
rgbValues[currentPixel + 2] = outColourR;
}
break;
case enPixelCompare.pc_RGB_single:
if (((rgbValues[currentPixel] >= inColourB_min) && (rgbValues[currentPixel] <= inColourB_max)) ||
((rgbValues[currentPixel + 1] >= inColourG_min) && (rgbValues[currentPixel + 1] <= inColourG_max)) ||
((rgbValues[currentPixel + 2] >= inColourR_min) && (rgbValues[currentPixel + 2] <= inColourR_max)))
{
rgbValues[currentPixel] = outColourB;
rgbValues[currentPixel + 1] = outColourG;
rgbValues[currentPixel + 2] = outColourR;
}
break;
case enPixelCompare.pc_Brightness:
double currentBrighness = (double)(rgbValues[currentPixel + 2]+rgbValues[currentPixel + 2]+
rgbValues[currentPixel] +
rgbValues[currentPixel + 1]+rgbValues[currentPixel + 1]+rgbValues[currentPixel + 1])
/6.0;
if (Math.Abs(currentBrighness - newColorBrightness) <= Tolerance)
{
rgbValues[currentPixel] = outColourB;
rgbValues[currentPixel + 1] = outColourG;
rgbValues[currentPixel + 2] = outColourR;
}
break;
}
}
}
// Copy the RGB values back to the bitmap
Marshal.Copy(rgbValues, 0, ptr, numBytes);
// Unlock the bits.
newBitmap.UnlockBits(bmpData);
return newBitmap;
}
/// <summary>
/// (see http://stackoverflow.com/questions/16346212/can-you-change-one-colour-to-another-in-an-bitmap-image
/// and https://msdn.microsoft.com/en-GB/library/ms229672%28v=vs.90%29.aspx)
/// </summary>
/// <param name="bmp"></param>
/// <param name="inColourR"></param>
/// <param name="inColourG"></param>
/// <param name="inColourB"></param>
/// <param name="outColourR"></param>
/// <param name="outColourG"></param>
/// <param name="outColourB"></param>
internal unsafe static Bitmap changeColour(this Bitmap original, Color oldColor, Color newColor, int Tolerance = 0, enPixelCompare CompareType = enPixelCompare.pc_RGB_all)
{
byte inColourR_max, inColourG_max, inColourB_max;
byte inColourR_min, inColourG_min, inColourB_min;
byte outColourR, outColourG, outColourB;
int tempValue;
//create a clone of the original
Bitmap newBitmap = (Bitmap)original.Clone();
tempValue = (int)oldColor.R + Tolerance;
inColourR_max = (tempValue > 255) ? (byte)255 : (byte)tempValue;
tempValue = (int)oldColor.G + Tolerance;
inColourG_max = (tempValue > 255) ? (byte)255 : (byte)tempValue;
tempValue = (int)oldColor.B + Tolerance;
inColourB_max = (tempValue > 255) ? (byte)255 : (byte)tempValue;
tempValue = (int)oldColor.R - Tolerance;
inColourR_min = (tempValue < 0) ? (byte)0 : (byte)tempValue;
tempValue = (int)oldColor.G - Tolerance;
inColourG_min = (tempValue < 0) ? (byte)0: (byte)tempValue;
tempValue = (int)oldColor.B - Tolerance;
inColourB_min = (tempValue < 0) ? (byte)0 : (byte)tempValue;
outColourR = newColor.R;
outColourG = newColor.G;
outColourB = newColor.B;
// Specify a pixel format.
PixelFormat pxf = original.PixelFormat;
// Lock the bitmap's bits.
Rectangle rect = new Rectangle(0, 0, newBitmap.Width, newBitmap.Height);
BitmapData bmpData = newBitmap.LockBits(rect, ImageLockMode.ReadWrite, pxf);
// Get the address of the first line.
IntPtr ptr = bmpData.Scan0;
// Declare an array to hold the bytes of the bitmap.
// int numBytes = newBitmap.Width * newBitmap.Height * 3;
int numBytes = bmpData.Stride * newBitmap.Height;
byte[] rgbValues = new byte[numBytes];
// Copy the RGB values into the array.
Marshal.Copy(ptr, rgbValues, 0, numBytes);
double newColorBrightness = (double)(newColor.R + newColor.R + newColor.B + newColor.G + newColor.G + newColor.G) / 6.0;
// Manipulate the bitmap
for (int line = 0; line < bmpData.Height; line += 1)
{
for (int pixel = 0; (pixel + 3) < bmpData.Stride; pixel += 3)
{
int currentPixel = line * bmpData.Stride + pixel;
switch (CompareType)
{
case enPixelCompare.pc_RGB_all:
if (((rgbValues[currentPixel] >= inColourB_min) && (rgbValues[currentPixel] <= inColourB_max)) &&
((rgbValues[currentPixel + 1] >= inColourG_min) && (rgbValues[currentPixel + 1] <= inColourG_max)) &&
((rgbValues[currentPixel + 2] >= inColourR_min) && (rgbValues[currentPixel + 2] <= inColourR_max)))
{
rgbValues[currentPixel] = outColourB;
rgbValues[currentPixel + 1] = outColourG;
rgbValues[currentPixel + 2] = outColourR;
}
break;
case enPixelCompare.pc_RGB_single:
if (((rgbValues[currentPixel] >= inColourB_min) && (rgbValues[currentPixel] <= inColourB_max)) ||
((rgbValues[currentPixel + 1] >= inColourG_min) && (rgbValues[currentPixel + 1] <= inColourG_max)) ||
((rgbValues[currentPixel + 2] >= inColourR_min) && (rgbValues[currentPixel + 2] <= inColourR_max)))
{
rgbValues[currentPixel] = outColourB;
rgbValues[currentPixel + 1] = outColourG;
rgbValues[currentPixel + 2] = outColourR;
}
break;
case enPixelCompare.pc_Brightness:
double currentBrighness = (double)(rgbValues[currentPixel + 2] + rgbValues[currentPixel + 2] +
rgbValues[currentPixel] +
rgbValues[currentPixel + 1] + rgbValues[currentPixel + 1] + rgbValues[currentPixel + 1])
/ 6.0;
if (Math.Abs(currentBrighness - newColorBrightness) <= Tolerance)
{
rgbValues[currentPixel] = outColourB;
rgbValues[currentPixel + 1] = outColourG;
rgbValues[currentPixel + 2] = outColourR;
}
break;
}
}
}
// Copy the RGB values back to the bitmap
Marshal.Copy(rgbValues, 0, ptr, numBytes);
// Unlock the bits.
newBitmap.UnlockBits(bmpData);
return(newBitmap);
}
