Image DPI and Scaling, and Resultant File Sizes

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This article will show the results of some experimentation with modifying the scaling of images, and how this will affect PDF file size. The results are likely to surprise you, since first of all, this is not simply a matter of adjusting the scaling of the image in Properties > Image, since you can also set limits on the DPI and image quality at the moment you export to PDF.

Adjusting the Image File

Here is the simple Scribus document we will work with, a single US letter page with one image frame, and the entire image adjusted to frame size.

Doc with image.png

The original unscaled photo was 1.5MB in size, so that the resolution in the image frame was 553.5 DPI.