Set the Image's Gamma, Brightness, Contrast, Color; Enhance an Image's Edge; Turn it to a Grayscale Image; and Invert the Image.
Image Manipulation
#region Effects
#region Invert Image
/// <summary>
/// Inverts an Image with the option to Invert it's Transparency.
/// </summary>
/// <param name="bitmap">The Bitmap Image you want to Invert.</param>
/// <param name="InvertAlpha">True to Invert it's Transparency. False to Invert the Image Only.</param>
/// <returns>An Inverted Image</returns>
public Bitmap Invert(Bitmap bitmap)
{
//X Axis
int x;
//Y Axis
int y;
//For the Width
for (x = 0; x <= bitmap.Width - 1; x++)
{
//For the Height
for (y = 0; y <= bitmap.Height - 1; y += 1)
{
//The Old Color to Replace
Color oldColor = bitmap.GetPixel(x, y);
//The New Color to Replace the Old Color
Color newColor;
//Set the Color for newColor
newColor = System.Drawing.Color.FromArgb(oldColor.A, 255 - oldColor.R, 255 - oldColor.G, 255 - oldColor.B);
//Replace the Old Color with the New Color
bitmap.SetPixel(x, y, newColor);
}
}
//Return the Inverted Bitmap
return bitmap;
}
/// <summary>
/// Inverts an Image with the option to Invert it's Transparency.
/// </summary>
/// <param name="bitmap">The Bitmap Image you want to Invert.</param>
/// <param name="InvertAlpha">True to Invert it's Transparency. False to Invert the Image Only.</param>
/// <returns>An Inverted Image</returns>
public Bitmap Invert(Bitmap bitmap, bool InvertAlpha)
{
//X Axis
int x;
//Y Axis
int y;
//For the Width
for (x = 0; x <= bitmap.Width - 1; x++)
{
//For the Height
for (y = 0; y <= bitmap.Height - 1; y += 1)
{
//The Old Color to Replace
Color oldColor = bitmap.GetPixel(x, y);
//The New Color to Replace the Old Color
Color newColor;
//If the user has chosen to Invert the Transparency
if (InvertAlpha)
{
//Set the Color for newColor
newColor = System.Drawing.Color.FromArgb(255 - oldColor.A, 255 - oldColor.R, 255 - oldColor.G, 255 - oldColor.B);
}
else
{
//Set the Color for newColor
newColor = System.Drawing.Color.FromArgb(oldColor.A, 255 - oldColor.R, 255 - oldColor.G, 255 - oldColor.B);
}
//Replace the Old Color with the New Color
bitmap.SetPixel(x, y, newColor);
}
}
//Return the Inverted Bitmap
return bitmap;
}
#endregion
#region Grayscale
// <summary>
/// Convert an Image to a Grayscale Image.
/// </summary>
/// <param name="Bitmap">The Bitmap to Convert to Grayscale.</param>
/// <returns>A Grayscale Image.</returns>
public Bitmap MakeGrayscale(Bitmap Bitmap)
{
//Declare myBitmap as a new Bitmap with the same Width & Height
Bitmap myBitmap = new Bitmap(Bitmap.Width, Bitmap.Height);
for (int x = 0; x < Bitmap.Width; x++)
{
for (int y = 0; y < Bitmap.Height; y++)
{
//Get the Pixel
Color BitmapColor = Bitmap.GetPixel(x, y);
//Declare grayScale as the Grayscale Pixel
int grayScale = (int)((BitmapColor.R * 0.3) + (BitmapColor.G * 0.59) + (BitmapColor.B * 0.11));
//Declare myColor as a Grayscale Color
Color myColor = System.Drawing.Color.FromArgb(grayScale, grayScale, grayScale);
//Set the Grayscale Pixel
myBitmap.SetPixel(x, y, myColor);
}
}
return myBitmap;
}
#endregion
#region Gamma
private static Bitmap Gamma(Bitmap b, double red, double green, double blue)
{
if (red < .2 || red > 5) return b;
if (green < .2 || green > 5) return b;
if (blue < .2 || blue > 5) return b;
byte[] redGamma = new byte[256];
byte[] greenGamma = new byte[256];
byte[] blueGamma = new byte[256];
for (int i = 0; i < 256; ++i)
{
redGamma[i] = (byte)Math.Min(255, (int)((255.0 * Math.Pow(i / 255.0, 1.0 / red)) + 0.5));
greenGamma[i] = (byte)Math.Min(255, (int)((255.0 * Math.Pow(i / 255.0, 1.0 / green)) + 0.5));
blueGamma[i] = (byte)Math.Min(255, (int)((255.0 * Math.Pow(i / 255.0, 1.0 / blue)) + 0.5));
}
// GDI+ still lies to us - the return format is BGR, NOT RGB.
BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
int stride = bmData.Stride;
System.IntPtr Scan0 = bmData.Scan0;
unsafe
{
byte* p = (byte*)(void*)Scan0;
int nOffset = stride - b.Width * 3;
for (int y = 0; y < b.Height; ++y)
{
for (int x = 0; x < b.Width; ++x)
{
p[2] = redGamma[p[2]];
p[1] = greenGamma[p[1]];
p[0] = blueGamma[p[0]];
p += 3;
}
p += nOffset;
}
}
b.UnlockBits(bmData);
return b;
}
#endregion
#region Brightness
private static Bitmap Brightness(Bitmap b, int nBrightness)
{
if (nBrightness < -255 || nBrightness > 255)
return b;
// GDI+ still lies to us - the return format is BGR, NOT RGB.
BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
int stride = bmData.Stride;
System.IntPtr Scan0 = bmData.Scan0;
int nVal = 0;
unsafe
{
byte* p = (byte*)(void*)Scan0;
int nOffset = stride - b.Width * 3;
int nWidth = b.Width * 3;
for (int y = 0; y < b.Height; ++y)
{
for (int x = 0; x < nWidth; ++x)
{
nVal = (int)(p[0] + nBrightness);
if (nVal < 0) nVal = 0;
if (nVal > 255) nVal = 255;
p[0] = (byte)nVal;
++p;
}
p += nOffset;
}
}
b.UnlockBits(bmData);
return b;
}
#endregion
#region Contrast
private static Bitmap Contrast(Bitmap b, sbyte nContrast)
{
if (nContrast < -100) return b;
if (nContrast > 100) return b;
double pixel = 0, contrast = (100.0 + nContrast) / 100.0;
contrast *= contrast;
int red, green, blue;
// GDI+ still lies to us - the return format is BGR, NOT RGB.
BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
int stride = bmData.Stride;
System.IntPtr Scan0 = bmData.Scan0;
unsafe
{
byte* p = (byte*)(void*)Scan0;
int nOffset = stride - b.Width * 3;
for (int y = 0; y < b.Height; ++y)
{
for (int x = 0; x < b.Width; ++x)
{
blue = p[0];
green = p[1];
red = p[2];
pixel = red / 255.0;
pixel -= 0.5;
pixel *= contrast;
pixel += 0.5;
pixel *= 255;
if (pixel < 0) pixel = 0;
if (pixel > 255) pixel = 255;
p[2] = (byte)pixel;
pixel = green / 255.0;
pixel -= 0.5;
pixel *= contrast;
pixel += 0.5;
pixel *= 255;
if (pixel < 0) pixel = 0;
if (pixel > 255) pixel = 255;
p[1] = (byte)pixel;
pixel = blue / 255.0;
pixel -= 0.5;
pixel *= contrast;
pixel += 0.5;
pixel *= 255;
if (pixel < 0) pixel = 0;
if (pixel > 255) pixel = 255;
p[0] = (byte)pixel;
p += 3;
}
p += nOffset;
}
}
b.UnlockBits(bmData);
return b;
}
#endregion
#region Color
private static Bitmap Color(Bitmap b, int red, int green, int blue)
{
if (red < -255 || red > 255) return b;
if (green < -255 || green > 255) return b;
if (blue < -255 || blue > 255) return b;
// GDI+ still lies to us - the return format is BGR, NOT RGB.
BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
int stride = bmData.Stride;
System.IntPtr Scan0 = bmData.Scan0;
unsafe
{
byte* p = (byte*)(void*)Scan0;
int nOffset = stride - b.Width * 3;
int nPixel;
for (int y = 0; y < b.Height; ++y)
{
for (int x = 0; x < b.Width; ++x)
{
nPixel = p[2] + red;
nPixel = Math.Max(nPixel, 0);
p[2] = (byte)Math.Min(255, nPixel);
nPixel = p[1] + green;
nPixel = Math.Max(nPixel, 0);
p[1] = (byte)Math.Min(255, nPixel);
nPixel = p[0] + blue;
nPixel = Math.Max(nPixel, 0);
p[0] = (byte)Math.Min(255, nPixel);
p += 3;
}
p += nOffset;
}
}
b.UnlockBits(bmData);
return b;
}
#endregion
#region EdgeEnhance
private static Bitmap EdgeEnhance(Bitmap b, byte nThreshold)
{
// This one works by working out the greatest difference between a nPixel and it's eight neighbours.
// The threshold allows softer edges to be forced down to black, use 0 to negate it's effect.
Bitmap b2 = (Bitmap)b.Clone();
// GDI+ still lies to us - the return format is BGR, NOT RGB.
BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
BitmapData bmData2 = b2.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
int stride = bmData.Stride;
System.IntPtr Scan0 = bmData.Scan0;
System.IntPtr Scan02 = bmData2.Scan0;
unsafe
{
byte* p = (byte*)(void*)Scan0;
byte* p2 = (byte*)(void*)Scan02;
int nOffset = stride - b.Width * 3;
int nWidth = b.Width * 3;
int nPixel = 0, nPixelMax = 0;
p += stride;
p2 += stride;
for (int y = 1; y < b.Height - 1; ++y)
{
p += 3;
p2 += 3;
for (int x = 3; x < nWidth - 3; ++x)
{
nPixelMax = Math.Abs((p2 - stride + 3)[0] - (p2 + stride - 3)[0]);
nPixel = Math.Abs((p2 + stride + 3)[0] - (p2 - stride - 3)[0]);
if (nPixel > nPixelMax) nPixelMax = nPixel;
nPixel = Math.Abs((p2 - stride)[0] - (p2 + stride)[0]);
if (nPixel > nPixelMax) nPixelMax = nPixel;
nPixel = Math.Abs((p2 + 3)[0] - (p2 - 3)[0]);
if (nPixel > nPixelMax) nPixelMax = nPixel;
if (nPixelMax > nThreshold && nPixelMax > p[0])
p[0] = (byte)Math.Max(p[0], nPixelMax);
++p;
++p2;
}
p += nOffset + 3;
p2 += nOffset + 3;
}
}
b.UnlockBits(bmData);
b2.UnlockBits(bmData2);
return b;
}
#endregion
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