@olifaunt, it's about sharing flickr photos online (forums, etc.).
You can't display a photo in RFF forum with a flickr link (
https://flic.kr/p/ZoCYFG) like this:
HTML:
[IMG]https://flic.kr/p/ZoCYFG[/IMG]
It won't be displayed, see...
You have to use direct (static) link to the image. And since such a link can only point to a single size, flickr prepares various sizes of the same picture. Then you can use desired size from the set of pre-resized versions of the photo and display it inline in a forum (RFF is on ancient tech, more modern stuff can chew through dynamic content so more "advanced" stuff can be done on the hosting site), like this:
HTML:
[IMG]https://live.staticflickr.com/4489/37668513406_ba629afa58_c.jpg[/IMG]
And then it works:
I guess Erik likes to share his photos in 584 x 800 for landscape and 467 x 640, which is very sensible since some people don't have huge resolution screens and that way they can see the image without scrolling left and right, up and down to see the entire picture.
The problem Erik has noticed is that flickr is now, by default, serving static pictures with lower quality, therefore less sharp. For the time, the old pictures are still available, but might not be for much longer.
This is the old, sharper version of the same flickr photo:
HTML:
[IMG]https://farm1.staticflickr.com/4489/37668513406_ba629afa58_c.jpg[/IMG]
Difference might be less or more noticeable (depending on the photo and the screen you are using), but it definitely is there. If it's not (download both versions from farm1.staticflickr.com and live.staticflickr.com and compare sizes), then it just means that the new flickr owners haven't transitioned your photos to lesser quality yet...