Thanks for your response.
Yes, I always re-upload images to test. I have also tried the wp-resized-image-quality plugin, which I noticed was working for some thumbs but not for my main images when used on a page, neither did it keep the original image quality/size.
There’s obviously some conflicting code or something preventing any of these methods from working.
I’m using the Enfold theme if that makes any difference.
Also I found that the original jpeg files are also compressed, so there is no master image file to regenerate from.
It’s also not a retina issue which I beleive others have managed to solve with a retina x2 plugin.
Using png images works as a lossless option, but these are obviously too big/slow.
One workaround I have, which isn’t great, is to drop the original jpeg file (with a new filename) in the public_html/wp-content/uploads part of my site file browser and later alter the URL of the images in the code to point to that new image, which manages to bypass the wp compression.
But surely there’s a better solution which enables me to use the media upload within wordpress and use high quality images on my website… ?
Thanks
