static void Main(string[] args)
{
string supportPath = "..\\..\\..\\..\\..\\..\\SupportFiles\\";
FileStream fs = File.OpenRead(supportPath + "PDF4NET.pdf");
PDFFixedDocument document = new PDFFixedDocument(fs);
fs.Close();
PDFPageRenderer pageRenderer = new PDFPageRenderer(document.Pages[0]);
PDFRendererSettings settings = new PDFRendererSettings(144, 144);
PDFBlackWhiteRenderingSurface bwSurface = pageRenderer.CreateRenderingSurface <PDFBlackWhiteRenderingSurface>(settings.DpiX, settings.DpiY);
// Use a simple threshold filter for conversion to B/W
// Everything below 128 becomes black, everything above 128 becomes white
bwSurface.BinarizationFilter = new PDFThresholdFilter(128);
settings.RenderingSurface = bwSurface;
// Output will be a 1bit B/W PNG
FileStream pngStream = File.Create("PDF4NET.Page.0.Dithering-Off.png");
pageRenderer.ConvertPageToImage(pngStream, PDFPageImageFormat.Png, settings);
pngStream.Flush();
pngStream.Close();
// Use a dithering filter for conversion to B/W
bwSurface.BinarizationFilter = new PDFFloydSteinbergDitheringFilter();
// Output will be a 1bit B/W PNG
pngStream = File.Create("PDF4NET.Page.0.Dithering-On.png");
pageRenderer.ConvertPageToImage(pngStream, PDFPageImageFormat.Png, settings);
pngStream.Flush();
pngStream.Close();
}
static void Main(string[] args)
{
string supportPath = "..\\..\\..\\..\\..\\..\\SupportFiles\\";
FileStream fs = File.OpenRead(supportPath + "PDF4NET.pdf");
PDFFixedDocument document = new PDFFixedDocument(fs);
fs.Close();
PDFDocumentRenderer documentRenderer = new PDFDocumentRenderer(document);
PDFRendererSettings settings = new PDFRendererSettings(144, 144);
PDFBlackWhiteRenderingSurface bwSurface = new PDFBlackWhiteRenderingSurface();
bwSurface.BinarizationFilter = new PDFFloydSteinbergDitheringFilter();
settings.RenderingSurface = bwSurface;
// Output will be a 1bit B/W CCIT G4 compressed multipage TIFF
FileStream tiffStream = File.Create("PDF4NET.tif");
documentRenderer.ConvertToMultipageImage("0-3", settings, PDFPageImageFormat.Tiff, tiffStream);
tiffStream.Flush();
tiffStream.Close();
}
