static public void ProcessImage(Element image)
{
bool image_mask = image.IsImageMask();
bool interpolate = image.IsImageInterpolate();
int width = image.GetImageWidth();
int height = image.GetImageHeight();
int out_data_sz = width * height * 3;
Console.WriteLine("Image: width=\"{0:d}\" height=\"{1:d}\"", width, height);
// Matrix2D mtx = image.GetCTM(); // image matrix (page positioning info)
// ++image_counter;
// System.Drawing.Bitmap bmp = image.GetBitmap();
// bmp.Save(output_path + "reader_img_extract_" + image_counter.ToString() + ".png", System.Drawing.Imaging.ImageFormat.Png);
//
// Alternatively you can use GetImageData to read the raw (decoded) image data
// image.GetBitsPerComponent();
// image.GetImageData(); // get raw image data
// another approach is to use Image2RGB filter that converts every image to
// RGB format. This could save you time since you don't need to deal with color
// conversions, image up-sampling, decoding etc.
// ----------------
Image2RGB img_conv = new Image2RGB(image); // Extract and convert image to RGB 8-bpc format
FilterReader reader = new FilterReader(img_conv); //
byte[] image_data_out = new byte[out_data_sz]; // A buffer used to keep image data.
reader.Read(image_data_out); // image_data_out contains RGB image data.
// ----------------
// Note that you don't need to read a whole image at a time. Alternatively
// you can read a chuck at a time by repeatedly calling reader.Read(buf, buf_sz)
// until the function returns 0.
}
static byte[] FlipImage(Element element)
{
Image2RGB image2rgb = new Image2RGB(element);
int width = element.GetImageWidth();
int height = element.GetImageHeight();
int out_data_sz = width * height * 3;
int stride = width * 3;
FilterReader reader = new FilterReader(image2rgb);
byte[] image_data = new byte[out_data_sz];
byte[] flipped_data = new byte[out_data_sz];
reader.Read(image_data);
for (int row = 0; row < height; ++row)
{
Buffer.BlockCopy(image_data, row * stride, flipped_data, out_data_sz - (stride * (row + 1)), stride);
}
return(flipped_data);
}
static void ImageExtract(PDFDoc doc, ElementReader reader)
{
Element element;
while ((element = reader.Next()) != null)
{
switch (element.GetType())
{
case Element.Type.e_image:
case Element.Type.e_inline_image:
{
Console.WriteLine("--> Image: {0}", ++image_counter);
Console.WriteLine(" Width: {0}", element.GetImageWidth());
Console.WriteLine(" Height: {0}", element.GetImageHeight());
Console.WriteLine(" BPC: {0}", element.GetBitsPerComponent());
Matrix2D ctm = element.GetCTM();
double x2 = 1, y2 = 1, y1 = ctm.m_v;
ctm.Mult(ref x2, ref y2);
// Write the coords to 3 decimal places.
Console.WriteLine(" Coords: x1={0:N2}, y1={1:N2}, x2={2:N2}, y2={3:N2}", ctm.m_h, ctm.m_v, x2, y2);
pdftron.PDF.Image image = null;
if (element.GetType() == Element.Type.e_image)
{
image = new pdftron.PDF.Image(element.GetXObject());
// Convert PDF bitmap to GDI+ Bitmap...
//Bitmap bmp = element.GetBitmap();
//bmp.Save(fname, ImageFormat.Png);
//bmp.Dispose();
// Instead of converting PDF images to a Bitmap, you can also extract
// uncompressed/compressed image data directly using element.GetImageData()
// as illustrated in ElementReaderAdv sample project.
}
else // inline image
{
if (y1 > y2)
{
byte[] flipped_image = FlipImage(element);
image = pdftron.PDF.Image.Create(doc, flipped_image, element.GetImageWidth(), element.GetImageHeight(), 8, ColorSpace.CreateDeviceRGB());
}
else
{
Image2RGB image2rgb = new Image2RGB(element);
FilterReader image_reader = new FilterReader(image2rgb);
image = pdftron.PDF.Image.Create(doc, image_reader, element.GetImageWidth(), element.GetImageHeight(), 8, ColorSpace.CreateDeviceRGB());
}
}
string fname = output_path + "image_extract1_" + image_counter.ToString();
image.Export(fname); // or ExporAsPng() or ExporAsTiff() ...
break;
}
case Element.Type.e_form: // Process form XObjects
{
reader.FormBegin();
ImageExtract(doc, reader);
reader.End();
break;
}
}
}
}
