private string DetectInvisibleWatermark() //Extract invisible watermark
{
water = new Watermark(_boxSize, _errorCorrection, _opacity, _s1, _s2);
using (CStreamReader reader = InputPicture.CreateReader())
{
using (Bitmap bitmap = new Bitmap(reader))
{
if (_stopped)
{
return("");
}
return(water.extractText(bitmap));
}
}
}
private void CreateInvisibleWatermark() //Embed invisible Watermark
{
water = new Watermark(_boxSize, _errorCorrection, _opacity, _s1, _s2);
using (CStreamReader reader = InputPicture.CreateReader())
{
using (Bitmap bitmap = new Bitmap(reader))
{
if (_stopped)
{
return;
}
water.embed(bitmap, Watermark);
CreateOutputStream(bitmap);
}
}
}
private void WmVisibleText() //Embed visible text
{
using (CStreamReader reader = InputPicture.CreateReader())
{
using (Bitmap bitmap = new Bitmap(reader))
{
Bitmap image = PaletteToRGB(bitmap);
Image photo = image;
int width = photo.Width;
int height = photo.Height;
Bitmap bitmapmPhoto = new Bitmap(width, height, PixelFormat.Format24bppRgb);
bitmapmPhoto.SetResolution(72, 72);
Graphics graphicPhoto = Graphics.FromImage(bitmapmPhoto);
graphicPhoto.SmoothingMode = SmoothingMode.AntiAlias;
graphicPhoto.DrawImage(photo, new Rectangle(0, 0, width, height), 0, 0, width, height, GraphicsUnit.Pixel);
Font font = null;
SizeF size = new SizeF();
for (int i = _textSize; i > 3; i--) //Test which is the largest possible fontsize to be used
{
if (_stopped)
{
return;
}
font = new Font(_font, i, FontStyle.Bold);
size = graphicPhoto.MeasureString(Watermark, font);
if ((ushort)size.Width < (ushort)width) //Text fits into image
{
break;
}
}
int yPixlesFromBottom = 0;
switch (_location)
{
case (int)Location.Bottom:
yPixlesFromBottom = (int)(height * .05);
break;
case (int)Location.Top:
yPixlesFromBottom = (int)(height * .95);
break;
case (int)Location.Other:
yPixlesFromBottom = (int)(height * _locationPercentage);
break;
}
float yPosFromBottom = ((height - yPixlesFromBottom) - (size.Height / 2));
float xCenterOfImg = ((float)width / 2f);
StringFormat strFormat = new StringFormat();
strFormat.Alignment = StringAlignment.Center;
SolidBrush semiTransBrush2 = new SolidBrush(Color.FromArgb(153, 0, 0, 0));
graphicPhoto.DrawString(Watermark, font, semiTransBrush2, new PointF(xCenterOfImg + 1, yPosFromBottom + 1), strFormat);
SolidBrush semiTransBrush = new SolidBrush(Color.FromArgb(153, 255, 255, 255));
graphicPhoto.DrawString(Watermark, font, semiTransBrush, new PointF(xCenterOfImg, yPosFromBottom), strFormat);
CreateOutputStream(bitmapmPhoto);
}
}
}
