| static public CreateGrayBitmapArray ( Image image ) : byte[] | ||
| image | Image | |
| return | byte[] | |
///// <summary>
///// Converts an image to grayscale.
///// http://bobpowell.net/grayscale.aspx
///// http://code.msdn.microsoft.com/windowsdesktop/ColorMatrix-Image-Filters-f6ed20ae
///// </summary>
///// <param name="img"></param>
///// <returns></returns>
//public static Bitmap ConvertGrayscale1(Bitmap img)
//{
// Bitmap dest = new Bitmap(img.Width, img.Height);
// dest.SetResolution(img.HorizontalResolution, img.VerticalResolution);
// ColorMatrix cm = new ColorMatrix(new float[][]{
// new float[]{0.3f,0.3f,0.3f,0,0},
// new float[]{0.59f,0.59f,0.59f,0,0},
// new float[]{0.11f,0.11f,0.11f,0,0},
// new float[]{0,0,0,1,0,0},
// new float[]{0,0,0,0,1,0},
// new float[]{0,0,0,0,0,1}});
// ImageAttributes ia = new ImageAttributes();
// ia.SetColorMatrix(cm);
// using (Graphics g = Graphics.FromImage(dest))
// {
// g.DrawImage(img, new Rectangle(0, 0, img.Width, img.Height), 0, 0, img.Width, img.Height, GraphicsUnit.Pixel, ia);
// }
// return dest;
//}
/// <summary>
/// Converts an image to 8bpp indexed grayscale.
/// http://www.codeproject.com/Articles/70442/C-RGB-to-Palette-Based-bit-Greyscale-Bitmap-Clas
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static Image ConvertGrayscale(Image input)
{
if (input.PixelFormat == PixelFormat.Format8bppIndexed)
{
return(input); // if already grayscale
}
byte[] gray = GrayBMP_File.CreateGrayBitmapArray(input);
Image result = ImageConverter.byteArrayToImage(gray);
((Bitmap)result).SetResolution(input.HorizontalResolution, input.VerticalResolution);
return(result);
}
/// <summary>
/// Convert an image to 8-bit indexed gray
/// </summary>
/// <param name="imgInput"></param>
/// <returns></returns>
public static Image ConvertGrays(Image imgInput)
{
if (imgInput.PixelFormat == System.Drawing.Imaging.PixelFormat.Format8bppIndexed)
{
return(imgInput); //Check the input image and return itself if it being desired format
}
{
byte[] gray = GrayBMP_File.CreateGrayBitmapArray(imgInput);
Image result = ImageConverter.byteArrayToImage(gray);
Bitmap tempResult = (Bitmap)result;
tempResult.SetResolution(imgInput.HorizontalResolution, imgInput.VerticalResolution);
return(tempResult);
}
}