Overview

The DynamicPDF Rasterizer is DynamicPDF's product designed specifically for converting PDF documents into images. It support JPEG, BMP, PNG, GIF, and TIFF image formats.

The DynamicPDF Rasterizer creates rasterized images (JPEG, BMP, PNG, GIF, TIFF) from a PDF document.

PdfRasterizer Class

The PdfRasterizer class is the class provided by the DynamicPdf Rasterizer for rasterizing PDF documents into images.

PdfRasterizer has four constructors and three properties: BackgroundColor, CachePages, and Pages. The class has fifteen methods, including methods for appending PDFs to a PdfRasterizer instance and drawing the rasterized PDF to an in image.

The PdfRasterizer has five methods for outputting a rasterized PDF to an image. It has two overloads methods for outputting a rasterized PDF and three method overloads for drawing a rasterized PDF to a multi-page TIFF.

• Draw(ImageFormat, ImageSize)
• Draw(String, ImageFormat, ImageSize)
• DrawToMultiPageTiff(Stream, TiffImageFormat, ImageSize)
• DrawToMultiPageTiff(String, TiffImageFormat, ImageSize)
• DrawToMultiPageTiff(TiffImageFormat, ImageSize).

Examples

The following two examples illustrate using the PdfRasterizer class to create a PNG from a single-page PDF document, followed by an example illustrating how to create a multi-page TIFF from a three page PDF document.

Using DynamicPDF Rasterizer

The following lists the most common flow for writing applications that use DynamicPDF Rasterizer.

1. Specify the PDF Input File. Create a PdfRasterizer instance and specify the PDF's input file path in the constructor.
2. Define the Output Image Format and Output Image Size. Note that defining an ImageFormat object specifies the image type (JPEG, BMP, PNG, GIF, TIFF) while defining an ImageSize object specifies the output image size.
3. Specify the Output File Name and Location. Finally, specify the file name and location of the output file.

PNG Example

The following example takes a single-page PDF and produces a single PNG.

PdfRasterizer rasterizer = new PdfRasterizer("single-page.pdf");
rasterizer.Draw("single-page-pdf-to-png-output.png", ImageFormat.Png, ImageSize.Dpi300);

Dim rasterizer As New PdfRasterizer("single-page.pdf")
rasterizer.Draw("single-page-pdf-to-png-output.png", ImageFormat.Png, ImageSize.Dpi300)

TIFF Example

The following example takes a two-page PDF and produces two TIFF images as separate images (pdf-to-tiff-one-output.tif and pdf-to-tiff-one-output2.tif).

PdfRasterizer rasterizer = new PdfRasterizer("DocumentA.pdf");
rasterizer.Draw("pdf-to-tiff-one-output.tif", ImageFormat.TiffWithLzw, ImageSize.Dpi150);

Dim rasterizer As New PdfRasterizer("single-page.pdf")
rasterizer.Draw("single-page-pdf-to-png-output.png"), ImageFormat.Png, ImageSize.Dpi300)

Multi-Page TIFF Example

The following example uses the same PDF as the previous example, only rather than producing multiple TIFF images, it creates one multi-page TIFF.

PdfRasterizer rasterizer = new PdfRasterizer("DocumentA.pdf");
FixedImageSize fixedImageSize = new FixedImageSize(595, 841);
rasterizer.DrawToMultiPageTiff("output-multipage-tiff.tif", ImageFormat.TiffWithLzw, fixedImageSize);

Dim rasterizer As New PdfRasterizer("DocumentA.pdf")
Dim fixedImageSize As New FixedImageSize(595, 841)       rasterizer.DrawToMultiPageTiff("output-multipage-tiff.tif"), ImageFormat.TiffWithLzw, fixedImageSize)