I know all about how adding image sizes work, I was just curious because what I usually need to do is more complex.
For and example, someone will put text in an image, not matter how many times I tell them not to. When these images with text are reduced in size the text becomes illegible. So what they want to do is have an alternate image that is cropped differently, narrow and taller than the original with text added to that image that is legible at that size. So basically, using completely different images at different screen resolutions. The srcset attribute allows for this to be done.
I’ll have to take a look at that plugin and dig around in it. I’m thinking that this could be entirely possible using ACF to create custom fields on image media files so that users can select alternate size images in the media library for each image and size that needs to be displayed.
