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Archives and Special Collections: Digitised Collections Online: Mirador viewer

The Mirador image viewer

The default viewer for our digital images is currently adapted from the Mirador 2 viewer. As our content is IIIF compliant you can use other viewers, but here are guidelines on what this image viewer can do.


screenshot of Mirador image viewer


1 Add more sets of images - see advanced options
2 Toggle side panel. If no index is visible, clicking on this removes the empty panel and gives more space to view the images
3 Help - opens this page
4 Sharing - see re-using the images
5 Change layout - (similar to 1 but more options) see advanced options
6 Full screen - toggles to full screen view (Esc to return) (does the same as 9)
7 Different views of the set of images - see image views
8 Information about the material - see metadata
9 Full screen (does the same as 6)
10 If a table of contents has been created for the images, it will display in the panel below. If this panel is showing the layers, clicking on the index tab switches to show the table of contents (or a blank panel if no table of contents present)
11 Layers
12 Annotations toggle on/off - see annotations
13 Image adjustment - see image manipulation
14 Move to next image (when possible to move to next or previous image, navigational arrows appear at both left and right of display screen)
15 Image zoom and move within current image. With a mouse, touchpad or touch screen interface the plus (+) zooms in on the image, the minus (-) zooms out. Once the image is larger than the screen, the 4 arrows enable you to move around the image and the house icon returns the image to the size at which it was initially displayed.
16 Thumbnail view toggle on/off
17 Current URL - see referencing current view
18 Scroll slider

Image views

There are 4 ways of displaying the image within the viewer. If the viewer is displaying a single image rather than a sequence (such as a map or photograph), some of these views make no difference.

Image view: display images one at a time, move through them using arrow(s) (14)

Book view: displays images in pairs, as if the openings of a book (works best with separate images of each page)

Scroll view: displays images in a single sequence which can be scrolled through using the scroll slider (18)

Gallery view: displays images in rows across the screen which can be scrolled down using a scroll bar that appears at the right of the display screen

The thumbnail bar only displays in image or book view (thumbnails can take a long time to load). They can be hidden or revealed by clicking on the three dots (16)

Image manipulation

Click on the grayed-out sliders icon (13) to pop out some buttons that will change the appearance of the image currently being viewed.


Image slider control in Mirador viewer

A Show / hide image manipulation tools
B Rotate 90º clockwise
C Rotate 90º anticlockwise
D Adjust brightness (slider)
E Adjust contrast (slider)
F Adjust colour saturation (slider)
G Toggle grayscale / colour
H Invert colours
I Reset to original

These tools are most useful for helping to read documents - changing the colour and contrast can improve legibility. If the original is grayscale, G will have no effect, but H can still be useful. There is no way to preserve the exact results other than taking a screenshot.


Clicking on the info icon (8) drops down more information about the digitised item, including the IIIF manifest and a link to the catalogue record (unfortunately the ones ending .bxxxxxxxx do not currently work).


It is possible in IIIF to annotate images with text, images or other digital media. In general if (12) is greyed-out, annotations cannot be seen. As there are very few annotations on the site at present, it is unlikely that anything would be available. There is not, within the viewer, a way of alerting to the presence of annotations, so for the most part this feature can be ignored at present.

Advanced options

One of the main strengths of the Mirador viewer is the ability to display several images side by side for comparison. To do this requires additional viewing slots to be added, using either (1) or (5) These can then have IIIF manifests added to them using Add item or by drag and drop. If Add item is used, the url of the IIIF manifest should be pasted into the "Add new object from URL" box.