The DRC's Various Media Presentation Methods and Related Specs
Content from Jeff Craft, DRC staff, via Janet Carleton.
There are a couple presentation methods used with images at the moment. While big images are great and encouraged, sometimes that's not always
possible and lightbox works pretty nicely without having to directly download the image to desktop, or view it just as an image in-browser.
1) Lightbox ("medium" size images)
specs: generally speaking, a jpeg that fills a large portion of a browser's viewing area is perfect for lightbox. 600-700 pixels on a side for lightbox presentation. While a bigger jpeg (up to 2000 pixels per side) could also be made available for direct download, or see #2 for presenting one of this size...
2) Zoomify ("large" size images)
specs: when the image gets to be over 2000 pixels per side, up to 5000+ pixels per side, Zoomify is a great option for presentation. These are either JPGs, TIFs, or JP2s that must be converted here at OhioLINK into a format Zoomify recognizes (PFF file). Great images for Zoomify are those that are much larger than the average viewing area of a browser window or the monitor itself when viewed at 100%. We have some that are 8000+ pixels on a side. Color over B&W is also better for this.
That is a current implementation. These specs will be changing soon. Our Educational Films & Documentaries Video Collection that was migrated from the DMC is made up of items that have a Real Media (archival) and FLV flash video (presentation) files at a 480x360 resolution. Going forward we are looking into our flash player being able to play MP4 files as the presentation file (H.264 encoded at a resolution of 480x360). (The archival video file in this collection will be a DVD-quality M2P file.)
Specs: mp3s (I don't know the detailed specs at the moment but can check into this.) These are played with a flash player.
This is just to show a display method for when an item has a large number of bitstreams. This example is for images displaying in Zoomify but the carousel display could be set up to act on other display methods, or even with video potentially. The specs for the carousel itself in the current DRC interface are just JPG images that are no more than 110 pixels wide by no more than 150 pixels in height. These are usually derived from what ever the main archival images happens to be for the item. We have an app that can batch generate the carousel images, but certainly could be something the liaison could do themselves. I can point to our documentation for creation of the carousel images if you want.
One final important note: specs and the guidelines above are not set in stone, but are a very general guideline in some cases. Presentation methods are always evolving and change over time so these guidelines would also change over time.