How to use Diva.js:
To browse through the pages within a document, simply scroll through the document panel using the scrollwheel, the scrollbar, the arrow keys or the page up/page down keys. To zoom in, click the plus button or double-click a page within the document viewer. To zoom out, click the minus button or hold the control key while double-clicking a page. You can enter and subsequently exit fullscreen mode by clicking the icon in the top right corner.
To navigate larger documents, enter grid mode by clicking on the view icon in the upper right and selecting the grid, or go directly to a page by typing in the input box and clicking 'Go'.
To make adjustments to a page image, click the sliders icon at the top left of the page when in document mode. This will take you to the image manipulation mode, where you can toggle grayscale, inverted colours, and apply different filters by adjusting the sliders on the right.
To download the image of a page, click the down arrow at the upper left corner of the page. You will be taken straight to the full image, where you can right-click on the image or drag it onto your desktop to save it.
To view the metadata of an image (provided by the IIIF manifest), click the tag icon in the upper right.