I followed this article: http://imageresizing.net/blog/2013/effortless-responsive-images.
My images are stored on a CDN and after installing all the nuget packages, I got resizing to work, but the problem I ran into was that I had to add style="max-width:100%" to most of the images.
Also, I have a page where the same image appears in multiple spots and I guess Image Resizer thinks that this these spots should contain different sizes of the image, so it downloads 3 different versions which sort of defeats the purpose. Is this how it is supposed to work naturally?
As an example, I have imageA.png on a page and it might be in the top, middle, and bottom. Image Resizer is downloading a different version for each section.
What is the best way to use imageresizer with srcset? I can't seem to find any thing on it.
If I use the DiskCache plugin, will this serve images to other users that request the same size or is it just for the current user requesting it?
I'll try to break apart your 4-question question.
style="max-width:100%" to most of the images
CSS like img {max-width:100%} can do this globally. This rule is present by default in many themes/frameworks.
If an image appears in multiple spots, and those spots require differently sized/cropped versions of the image, there will be multiple requests. This is how it is supposed to work.
ImageResizer responds to URLs like "image.jpg?width=100" Just use those URLs as you would when using srcset normally. Here's the webkit demo.
DiskCache is not per-user. It is a global cache. It does re-apply authorization rules before serving from the cache.