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Addon
How can I load PDF/A files into the Dynamic Web TWAIN SDK?
Dynamic Web TWAIN can load PDF/A files. Whether you need the PDF Rasterizer Add-on (PDFR) depends entirely on the contents of the PDF/A document:
- If the PDF/A contains text or vector graphics, rasterization is required → PDFR license needed.
- If the PDF/A contains only raster images, the file can be loaded without the PDFR add-on.
Looking for information about generating PDF/A files?
Starting from Dynamic Web TWAIN 19.3, PDF/A creation is supported.
How to check whether rasterization is required
You can programmatically detect whether a given PDF/A file requires rasterization before loading it:
DWTObject.Addon.PDF.IsRasterizationRequired(path); // returns true or false
If this method returns true, the SDK will need the PDFR to process the file.
When rasterization actually happens
Dynamic Web TWAIN performs rasterization only when necessary. If IsRasterizationRequired() returns true and the PDF Rasterizer license is configured, the SDK automatically rasterizes the PDF into images using the reader settings you specify.
The rasterization behavior—including resolution (default 200 DPI) and other rendering parameters—can be customized through SetReaderOptions().
Rasterization may occur when using any of these APIs (including drag-and-drop):
-
LoadImage() -
LoadImageEx() -
LoadImageFromBase64Binary() -
LoadImageFromBinary() -
FTPDownload() -
FTPDownloadEx() -
HTTPDownload() -
HTTPDownloadEx() -
HTTPDownloadThroughPost() -
HTTPDownloadDirectly()
Original post creation date: Nov 30, 2021
Last modified date: Dec 11, 2025
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