Is it possible to have a page with a transparent background?
One of my pages has a single image taking up some space on the page. The rest of the space (the space not occupied by the image), should be transparent: that is, whenever I send it to the printing service, the base color of the selected paper should be visible, without any ink being printed on it (not even white - the paper will have a base color/texture that I do not want to print over)
Currently exporting the page to a png file creates an image with my original image on a white background, since that is what the background in scribus is set to. I do not want this: I want the image to be on a transparent background.
I have taken a look in all possible menu options and I have been unable to find where can I set the background color, which currently seems to be white. I do not know if it is possible to set the background color of a page, and in case it is possible, if it is possible to set it to transparent.
How can I achieve this in scribus?
For sending a document to be printed, don't use PNG as the export format. There are three reasons for this:
A printing press uses CMYK, and PNG is an RGB-only format.
If your document contains text, that text will be rasterized and will print at the resolution of your PNG (perhaps 300 ppi) instead of the 2800 dpi at which live text or vector information is converted in a RIP.
PNG does not contain a color profile, so not only are RGB > CMYK color changes going to occur, lack of a color profile in the image means that you have no idea what those color changes are likely to be.
Use the Scribus Print PDF workflow instead. Not only will this be a lot easier for your printer to deal with, the output quality will be much higher.
As everyone else has noted, white is transparent on press, so is not something to be concerned about.