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There are various ways to look at dossiers. In the service there are two different file formats, DjVu which is a compressed file format and TIFF which is a high-resolution file format.
DjVu
DjVu is a compressed file format that does not take as much storage space as a high-resolution file format – they are often a hundred times smaller than high-resolution formats. When you click on the button Download the dossier as DjVu the dossier will be opened in a DjVu plugin or in a software that can read DjVu.
You must download a software to your computer. If you are using a PC and want to use features such as measure on map, magnifying glass or make other changes, it is this link (new window) you need to use.
If you have macOS you can download a free app that can read DjVu files. Go to the App Store and search for DjVu, choose an app and download.
If the dossier does not open directly, it is often located further down the page, as its own small window. Click on the three dots in the window, choose “Always open files of this type” so that it will open automatically next time you click on a DjVu link.
All pages belonging to a dossier will be downloaded to your computer before you can view the dossier. This means that it can take longer to download a dossier with many pages.
Link DjVu to a program
Do this to connect DjVu to a program:
- Open the Control panel
- Click on Programs
- Click on Standard programs
- Click on Associate a file type or protocol with a program
- You will now have a long list with different file types in the left column and programs in the column to the right of it.
- Browse to “.djv” and “.djvu” and choose DjVuViewer in the right column.
Tiff
Tiff is a high-resolution file format which is for example suitable for printing the map for a book. A high-resolution image can often be enlarged several times without the image becoming pixelated.
The digital file format Tiff has a resolution of 254 dpi (dots per inch) and 24 bits colour-depth for documents with coloured maps, and 200 dpi for documents with black and white text.
If you want to download a dossier as a TIFF, press Download the page as TIFF. When you download pages from a dossier as a TIFF file you will only get the page you are currently on, not the whole dossier.
Image viewer options for different browsers
Google Chrome
Download image viewer DjVu Viewer (new window).
When you open the dossier, you will see the dossier in the separate DjVu Viewer application. It is possible to have several dossiers open at the same time.
If you do not see a dossier and it is just a blank page, you may have downloaded an extension that must be removed before the dossier can be displayed. This occurs when you have previously used the DjVu plug-in in Chrome.
- Go to the Tools menu and select Extensions and remove the DjVu Extension DjVu.
- Download the image viewer DjVu Viewer (new window).
- The file / document is downloaded in the bottom left corner and then opened in DjVu Viewer.
- You can choose to always open Djvu files with DjVu Viewer.
Microsoft Edge
Download the image viewer DjVu Viewer (new window).
When you open the dossier, you will view the dossier in the separate DjVu Viewer application. You can have several dossiers open at the same time.
You can choose to always open Djvu files with DjVu Viewer.
Firefox
Download the image viewer DjVu Viewer (new window).
When you open the dossier, you will see the dossier in the separate DjVu Viewer application. You can have several dossiers open at the same time.
You can choose to always open Djvu files with DjVu Viewer.
Safari
As a Mac user, you need to install a program that can read DjVu formats and then select it as the default program to open DjVu files.
There are several DjVu viewer programs to choose from in Apple's own software store Appstore and these have different properties. Some have a free version but require a one-time purchase in order to use the program without restrictions.
Free versions are available to download outside of the Appstore but then you need to consider the security messages that macOS asks, in order to authorize installation of software from outside the Appstore.
At Lantmäteriet we work with Windows as a platform and therefore do not have the capacity to stay up to date to the same extent towards handling of DjVu files in macOS.
The possibility to download in pdf format is under construction and is planned to be offered in 2021 when we also rework the entire Historical Maps service.