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Why the files generated by PDF Driver are larger than the source files?
Probably, your Compression Settings are not correctly used. Let's take a look at how reducing resolution, modifying compression, and image down-sampling should be set as an emample.

1. Choose a lower resolution on General Tab. The default 600dpi maybe not suitable. Windows GDI generates more image data for Higher resolution.

2. Choose JPEG - Low to further reduce image size, while losing the quality.

3. Choose down-sample with lower resolution.

You can use all the methods above together to reduce image size as well. Some experiments might be needed to get the best results.

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