Converting Image From PDF File Using ASPPdf

Posted on by Oscar Connell

AspPDF is an ActiveX server component for dynamically creating, reading and modifying Portable Document Format (PDF) files.

PDF is the de-facto world-wide standard for creating and exchanging platform-independent printable documents. Giving your ASP/ASP.NET-based Web applications the power to generate and modify PDF documents on the fly opens endless opportunities for you and your users.

Automate form fill-out process. Create financial reports and invoices. Produce encrypted and digitally signed documents. Send secure email with file attachments. Convert HTML pages to PDF, and PDF pages to images. Stitch documents together and extract pages. Draw all major types of barcodes. In this post, I’ll show you how to converting image from PDF File.

Converting Image From PDF File Using ASPPdf

CMYK to RGB Conversion and Image Extration

Page photos created through the ToImage approach are always within the RGB shade area, but the original PDF being transformed to an image may include pictures and graphics inside the CMYK color room, during which situation they’ve got to become transformed to RGB.

To attain reasonably good color copy, the ToImage technique performs a collection of complex non-linear color transformations depending on profiles, the normal colour room definitions established from the Worldwide Colour Consortium (ICC).

Profile-based CMYK-to-RGB conversion is a fairly gradual method. Should your PDF doc contains huge high-resolution CMYK photos and overall performance is of essence, use the parameter FastCMYK=True which invokes a straightforward linear method for CMYK-to-RGB conversion and provides some overall performance improvement in the price of color-reproduction high quality.

The following pictures exhibit the result in the FastCMYK parameter:

ASPPdf Conversion

As an additional bonus, the PdfPreview object is capable of extracting images from a PDF page. The method PdfPreview.ExtractImage returns a new instance of the PdfPreview object representing an image specified by a 1-based index. This image can then be saved the regular way, via the methods Save, SaveToMemory or SaveHttp. If the specified index exceeds the number of images on the page, ExtractImage returns Nothing (or null in C#.)

The images are always saved as PNGs as this is PdfPreview’s format of choice.

The following code snippet opens a PDF documents and saves all of the images from page 1 to disk:

C#

IPdfManager objPDF = new PdfManager();
IPdfDocument objDoc = objPDF.OpenDocument( @"c:\path\document.pdf", Missing.Value );
IPdfPreview objPreview = objDoc.Pages[1].ToImage(Missing.Value);
int i = 1;
IPdfPreview objImage;

while( ( objImage = objPreview.ExtractImage(i++) ) != null )
{
   objImage.Save( @"c:\myprojects\aspdf\asp\files\image.png", false );
}

 VBScript

Set PDF = Server.CreateObject("Persits.PDF")
Set Doc = PDF.OpenDocument("c:\path\document.pdf")
Set Page = Doc.Pages(1)
Set Preview = Page.ToImage

i = 1
Do While True
   Set Image = Preview.ExtractImage(i)
   If Image Is Nothing Then
      Exit Do
   Else
      Image.Save "c:\path\image.png", False
   End If
   i = i + 1
Loop

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