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I'm having a similar issue with my website. Was there ever a solution for this? My pictures look fine on their own, but when they get on the site, the quality drops significantly. I attached the link to my site (a specific gallery for example) and a .jpg image file compared to a screengrab of the same image file in the gallery. It might be hard to tell from the screengrab, but my images show up considerably more blurry on the site. 

https://www.videtteonline.com/multimedia/gallery-isu-football-loses-mid-america-classic-in-heartbreaking-fashion/collection_dab707e2-54fd-11ee-9ac9-aff110557077.html

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