public static Bitmap GrayScale(Bitmap image, RGBcoefficientType otype)
{
Bitmap dstimage = null;
try
{
GrayScaleCoef coef;
if (otype == RGBcoefficientType.BT709)
coef = new GrayScaleCoef(0.2125, 0.7154, 0.0721);
else
coef = new GrayScaleCoef(0.5, 0.419, 0.081);
BitmapData sourceData, destinationData;
sourceData = image.LockBits(new Rectangle(0, 0, image.Width, image.Height), ImageLockMode.ReadOnly, image.PixelFormat);
dstimage = CreateGrayscaleImage(image.Width, image.Height);
destinationData = dstimage.LockBits(new Rectangle(0, 0, dstimage.Width, dstimage.Height), ImageLockMode.ReadWrite, dstimage.PixelFormat);
GetGrayScaleImage(sourceData, destinationData, coef);
dstimage.UnlockBits(destinationData);
image.UnlockBits(sourceData);
}
catch
{
}
return dstimage;
}
public static Bitmap GrayScale(Bitmap image, RGBcoefficientType otype)
{
Bitmap dstimage = null;
try
{
GrayScaleCoef coef;
if (otype == RGBcoefficientType.BT709)
{
coef = new GrayScaleCoef(0.2125, 0.7154, 0.0721);
}
else
{
coef = new GrayScaleCoef(0.5, 0.419, 0.081);
}
BitmapData sourceData, destinationData;
sourceData = image.LockBits(new Rectangle(0, 0, image.Width, image.Height), ImageLockMode.ReadOnly, image.PixelFormat);
dstimage = CreateGrayscaleImage(image.Width, image.Height);
destinationData = dstimage.LockBits(new Rectangle(0, 0, dstimage.Width, dstimage.Height), ImageLockMode.ReadWrite, dstimage.PixelFormat);
GetGrayScaleImage(sourceData, destinationData, coef);
dstimage.UnlockBits(destinationData);
image.UnlockBits(sourceData);
}
catch
{
}
return(dstimage);
}
private static unsafe void GetGrayScaleImage(BitmapData sourceData, BitmapData destinationData, GrayScaleCoef coef)
{
// get width and height
int width = sourceData.Width;
int height = sourceData.Height;
PixelFormat srcPixelFormat = sourceData.PixelFormat;
if (
(srcPixelFormat == PixelFormat.Format24bppRgb) ||
(srcPixelFormat == PixelFormat.Format32bppRgb) ||
(srcPixelFormat == PixelFormat.Format32bppArgb))
{
int pixelSize = (srcPixelFormat == PixelFormat.Format24bppRgb) ? 3 : 4;
int srcOffset = sourceData.Stride - width * pixelSize;
int dstOffset = destinationData.Stride - width;
// do the job
byte* src = (byte*)sourceData.Scan0.ToPointer();
byte* dst = (byte*)destinationData.Scan0.ToPointer();
// for each line
for (int y = 0; y < height; y++)
{
// for each pixel
for (int x = 0; x < width; x++, src += pixelSize, dst++)
{
*dst = (byte)(coef.cr * src[2] + coef.cg * src[1] + coef.cb * src[0]);
}
src += srcOffset;
dst += dstOffset;
}
}
}
private static unsafe void GetGrayScaleImage(BitmapData sourceData, BitmapData destinationData, GrayScaleCoef coef)
{
// get width and height
int width = sourceData.Width;
int height = sourceData.Height;
PixelFormat srcPixelFormat = sourceData.PixelFormat;
if (
(srcPixelFormat == PixelFormat.Format24bppRgb) ||
(srcPixelFormat == PixelFormat.Format32bppRgb) ||
(srcPixelFormat == PixelFormat.Format32bppArgb))
{
int pixelSize = (srcPixelFormat == PixelFormat.Format24bppRgb) ? 3 : 4;
int srcOffset = sourceData.Stride - width * pixelSize;
int dstOffset = destinationData.Stride - width;
// do the job
byte *src = (byte *)sourceData.Scan0.ToPointer();
byte *dst = (byte *)destinationData.Scan0.ToPointer();
// for each line
for (int y = 0; y < height; y++)
{
// for each pixel
for (int x = 0; x < width; x++, src += pixelSize, dst++)
{
*dst = (byte)(coef.cr * src[2] + coef.cg * src[1] + coef.cb * src[0]);
}
src += srcOffset;
dst += dstOffset;
}
}
}
