Doc AddImageFile Function. Extract an image from a file and add it to the current page. ABCpdf .NET PDF Library.

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AddImageFile Function    

Extract an image from a file and add it to the current page.

 

    
Syntax  

[C#]
int AddImageFile(string path)
int AddImageFile(string path, int frame)

[Visual Basic]
Function AddImageFile(path As String) As Integer
Function AddImageFile(path As String, frame As Integer) As Integer

Throws Exceptions may throw Exception()

 

    

Params		  
Name Description
path

A file path, URL or html string to be added to the page.

frame

Some image types support multiple frames or pages. This is the one based index specifying the required frame (default one).

return The Object ID of the newly added Image Object.

 

    

Notes		  

Adds an image to the current page returning the ID of the newly added object.

Images embedded using this method are always inserted using pass-through mode. Pass-through mode is faster than indirect mode. It allows the preservation of compression settings, native color spaces and ICC color profiles. It allows vector graphics to be maintained in vector format. However it supports a limited range of image formats - JPEG, JPEG 2000, TIFF, EMF, WMF, PS (PostScript) or EPS (Encapsulated PostScript). JPEG images may be grayscale, RGB or CMYK. TIFF images may be black and white, grayscale, RGB, CMYK, TIFF or Lab in a range of bit depths and with out without alpha. Because PDF does not support 32 bit High Dynamic Range (HDR) encodings, TIFFs in this format will be downsampled to 16 bits per component.

Note that not all EMF or WMF files can be directly imported this way. If this is the case you should look at using the XImage object. Using the XImage object with the default ReadModule is fast but will result in the image being rasterized. Using the XpsAny ReadModule will not be as fast but will preserve the vector nature of practically all such files.

The image is scaled to fill the current Rect. It is transformed using the current Transform.

Transparency. Occasionally you may find that you need to invert the transparency of your image. To do this you can assign a decode array using the ID returned from this function.

To invert the transparency:

theDoc.SetInfo(theDoc.GetInfoInt(theID, "XObject"), "/SMask*/Decode", "[1 0]")

A similar technique can be used for inverting or altering color levels on the image itself.

To invert an RGB image:

theDoc.SetInfo(theDoc.GetInfoInt(theID, "XObject"), "/Decode", "[1 0 1 0 1 0]")

 

    

Example		  

The following code adds an image to the current page positioned at the bottom left. The width and height of the image are automatically inferred from the file supplied.

[C#]
Doc theDoc = new Doc();
theDoc.Rect.String = "0 0 0 0";
string thePath = Server.MapPath("../mypics/pic.jpg");
theDoc.AddImageFile(thePath, 1);
theDoc.Save(Server.MapPath("docaddimage.pdf"));
theDoc.Clear();

[Visual Basic]
Dim theDoc As Doc = New Doc()
theDoc.Rect.String = "0 0 0 0"
Dim thePath As String = Server.MapPath("../mypics/pic.jpg")
theDoc.AddImageFile(thePath, 1)
theDoc.Save(Server.MapPath("docaddimage.pdf"))
theDoc.Clear()


docaddimage.pdf

 

    

 

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