We use an image server I wrote, Loris, plus OpenSeadragon. Here's an 

That image is 152500 x 4000 px:

Loris is on Github:
as is OpenSeadragon:

More generally, this is one of many problems IIIF (International Image 
Interoperability Framework) exists to try to solve. You might want to 
check out our site, which has links to other tools as well:

Hope this helps,

On 07/25/2014 11:36 AM, Jonathan Rochkind wrote:
> Does anyone have a good solution to recommend for display of very large images on the web?  I'm thinking of something that supports pan and scan, as well as loading only certain tiles for the current view to avoid loading an entire giant image.
> A URL to more info to learn about things would be another way of answering this question, especially if it involves special server-side software.  I'm not sure where to begin. Googling around I can't find any clearly good solutions.
> Has anyone done this before and been happy with a solution?
> Thanks for any info!
> Jonathan