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Q.  Rendering PDF seems to be quite slow even when using moderately sized images (pictures). I'm guessing that images somehow are "re-rendered" when generating PDF. Is there any way to speed up PDF rendering for images? What settings can I use, differences between image file formats, etc.? [No.2003030702]
A. 

It often happens when the compression method in the PDF Option dialog is set as Automatic.

It's because PDF Output Option supports JPEG-based compression and ZLIB-based compression when outputting raster graphics. By specifying 'Automatic' selection of compression method, this version PDF Output Option program calculates the size of compressed image for both compression methods for each page, selects smaller size of the two methods.

That is the images are created twice, the processing speed becomes lower.

To shorten the processing time to create PDF, you are recommended to specify JPEG or ZLIB compression method depending on your type of graphics. If your image is like a picture, select "JPEG", if it is like a business graphic, select "ZLIB".

The processing method is different in XSL Formatter V3, An original image processing function has been strengthened.

  1. In the case of the image type that is treatable by XSL Formatter and can be treated in PDF file without change, the original image file will be inserted in PDF.Therefore, the speed of processing has been improved.
  2. In the case of the image type that is treatable by XSL Formatter but can not be treated in PDF file, it is converted to the type which can be treated in PDF. In this case, the processing speed depends on resolution setting/compression setting as well as V2.
  3. On the Windows environment, the image type that is not treatable by XSL Formatter will be converted to BMP format by using the function of Windows or LeadTools. In this case, the processing speed depends on resolution setting/compression setting as well as V2.

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