public static Bitmap GetThumbnail(int width, int height, string filter, string caption, ImageFormat format, Image b)
{
Bitmap source = new Bitmap(b);
source = new Bitmap(source.GetThumbnailImage(width, height, null, IntPtr.Zero));
if (format == ImageFormat.Gif)
{
source = new OctreeQuantizer(0xff, 8).Quantize(source);
}
if ((filter.Length > 0) && filter.ToUpper().StartsWith("SHARPEN"))
{
string str = filter.Remove(0, 7).Trim();
int nWeight = (str.Length > 0) ? Convert.ToInt32(str) : 11;
BitmapFilter.Sharpen(source, nWeight);
}
if (caption.Length <= 0)
{
return(source);
}
using (Graphics graphics = Graphics.FromImage(source))
{
StringFormat format2 = new StringFormat();
format2.Alignment = StringAlignment.Center;
format2.LineAlignment = StringAlignment.Center;
using (Font font = new Font("Arial", 12f))
{
graphics.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;
graphics.FillRectangle(new SolidBrush(Color.FromArgb(150, 0, 0, 0)), 0, source.Height - 20, source.Width, 20);
graphics.DrawString(caption, font, Brushes.White, 0f, (float)(source.Height - 20));
return(source);
}
}
}
public static bool MeanRemoval(Bitmap b, int nWeight /* default to 9*/)
{
ConvMatrix m = new ConvMatrix();
m.SetAll(-1);
m.Pixel = nWeight;
m.Factor = nWeight - 8;
return(BitmapFilter.Conv3x3(b, m));
}
public static bool Smooth(Bitmap b, int nWeight /* default to 1 */)
{
ConvMatrix m = new ConvMatrix();
m.SetAll(1);
m.Pixel = nWeight;
m.Factor = nWeight + 8;
return(BitmapFilter.Conv3x3(b, m));
}
public static bool EmbossLaplacian(Bitmap b)
{
ConvMatrix m = new ConvMatrix();
m.SetAll(-1);
m.TopMid = m.MidLeft = m.MidRight = m.BottomMid = 0;
m.Pixel = 4;
m.Offset = 127;
return(BitmapFilter.Conv3x3(b, m));
}
public static bool Sharpen(Bitmap b, int nWeight /* default to 11*/)
{
ConvMatrix m = new ConvMatrix();
m.SetAll(0);
m.Pixel = nWeight;
m.TopMid = m.MidLeft = m.MidRight = m.BottomMid = -2;
m.Factor = nWeight - 8;
return(BitmapFilter.Conv3x3(b, m));
}
public static bool GaussianBlur(Bitmap b, int nWeight /* default to 4*/)
{
ConvMatrix m = new ConvMatrix();
m.SetAll(1);
m.Pixel = nWeight;
m.TopMid = m.MidLeft = m.MidRight = m.BottomMid = 2;
m.Factor = nWeight + 12;
return(BitmapFilter.Conv3x3(b, m));
}
public static bool EdgeDetectQuick(Bitmap b)
{
ConvMatrix m = new ConvMatrix();
m.TopLeft = m.TopMid = m.TopRight = -1;
m.MidLeft = m.Pixel = m.MidRight = 0;
m.BottomLeft = m.BottomMid = m.BottomRight = 1;
m.Offset = 127;
return(BitmapFilter.Conv3x3(b, m));
}
