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This article describes how to generate high-quality thumbnails and renditions using the Adobe PDF Rasterizer library.

Sometimes, when you upload large, content-intensive PDF or AI files to Adobe Experience Manager (AEM) Assets, the default library may not generate an accurate output. In such cases, Adobe's PDF Rasterizer library can generate more reliable and accurate output compared to the output from a default library.

Adobe recommends using the PDF Rasterizer library for the following:

  • Heavy, content intensive AI/PDF files
  • AI/PDF files with thumbnails not generated out of the box
  • AI files with Pantone Matching System (PMS) colors

Thumbnails and previews generated using PDF Rasterizer are better in quality compared to out-of-the-box output and, therefore, provide consistent viewing experience across devices. The Adobe PDF Rasterizer library does not support any color space conversion. It always outputs to RGB irrespective of the color space of the source file.

  1. Install the PDF Rasterizer package on your AEM instance from Package Share.

    Observação:

    The PDF Rasterizer library is available for Windows and Linux only.

  2. Access the AEM Assets Workflow console from http://<AEM server>:<Port>/workflow

  3. Open the DAM Update Asset workflow page.

  4. Configure the following to skip the default thumbnail and web rendition generation for PDF/AI files:

    • Open the Process Thumbnails step, and add application/pdf or application/postscript in the Skip Mime Types field under the Thumbnails tab as necessary.
    skip_mime_types
    • In the Web Enabled Image tab, add application/pdf or application/postscript under Skip List depending upon your requirements.
    web_enabled_imageskiplist
  5. Open the Rasterize PDF/AI Image Preview Rendition step, and remove the MIME type for which you want to skip the default generation of preview image renditions. For example, remove the MIME type application/pdfapplication/postscript, or application/illustrator from the MIME Types list.

    process_arguments
  6. Drag the PDF Rasterizer Handler step from the side panel to below the Process Thumbnails step.

  7. Configure the following arguments for the PDF Rasterizer Handler step:

    • Mime Types: application/pdf or application/postscript
    • Commands: PDFRasterizer -d -p 1 -s 1280 -t PNG -i ${file}
    • Add Thumbnail sizes: 319:319, 140:100, 48:48. Add custom thumbnail configuration, if necessary.

    The command line arguments for the PDFRasterizer command can include the following:

    -d: Flag to enable smooth rendering of text, vector artwork, and images. Creates better quality images. However, including this parameter causes the command to run slowly and increase the size of images.

    -p: Page number. Default value is all pages. '*' denotes all pages.

    -s: Maximum image dimension (height or width). This is converted to DPI for each page. If pages are of different size, each page can potentially scale by different amount. The default is actual page size.

    -t: Output image type. Valid types are JPEG, PNG, GIF, and BMP. The default value is JPEG.

    -i: Path for input PDF. It is a mandatory parameter.

    -h: Help

  8. To delete intermediate renditions, select Delete Generated Rendition.

  9. To let PDF Rasterize generate web renditions, select Generate Web Rendition.

    generate_web_renditions1
  10. Specify the settings in the Web Enabled Image tab.

    web_enabled_image1
  11. Save the workflow.

  12. To enable PDF Rasterizer to process PDF pages with PDF libraries, open the DAM Process Subasset model from the Workflow console.

  13. From the side panel, drag the the PDF Rasterizer Handler step under the Create Web-Enabled Image Rendition step.

  14. Configure the following arguments for the PDF Rasterizer Handler step:

    • Mime Types: application/pdf or application/postscript
    • Commands: PDFRasterizer -d -p 1 -s 1280 -t PNG -i ${file}
    • Add Thumbnail sizes: 319:319, 140:100, 48:48. Add custom thumbnail configuration, if necessary.

    The command line arguments for the PDFRasterizer command can include the following:

    -d: Flag to enable smooth rendering of text, vector artwork, and images. Creates better quality images. However, including this parameter causes the command to run slowly and increase the size of images.

    -p: Page number. Default value is all pages. '*' denotes all pages.

    -s: Maximum image dimension (height or width). This is converted to DPI for each page. If pages are of different size, each page can potentially scale by different amount. The default is actual page size.

    -t: Output image type. Valid types are JPEG, PNG, GIF, and BMP. The default value is JPEG.

    -i: Path for input PDF. It is a mandatory parameter.

    -h: Help

  15. To delete intermediate renditions, select Delete Generated Rendition.

  16. To let PDF Rasterize generate web renditions, select Generate Web Rendition.

    generate_web_renditions
  17. Specify the settings in the Web Enabled Image tab.

    web_enabled_image
  18. Save the workflow.

  19. Upload a PDF or AI file to AEM Assets. PDF Rasterizer generates the thumbnails and web renditions for the file.

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