Choosing the right format for the right use case is one of the most important decisions that a designer has to take. The file format is not about which software to use, but about what will be saved by this software inside the picture so that you can use it later in Scribus or any other document. Many users don't care enough about this step and miss very nice possibilities and need to tweak around when it should be so easy.
Mainly, we will have file formats for photos and other raster images, and formats for vector drawings. JPEG, PNG, PSD, or TIF are formats for photos and raster images, and EPS or SVG are formats for vector drawings. PDF is separate.
JPEG (Joint Photographic Expert Group) is a well-known image format—maybe the best known. It doesn't steal its place. It has a lot of qualities: it can drastically decrease the size of a file by compressing with a very high-level algorithm that interprets the content of an image and compresses it using some kind...