My current screens are also 2560x1440 (as are those on my wife's computer).
I've resized smaller images (1920/2048 to 2560, and they don't look bad,
but I generally try and match the images to the display resolution.

I haven't had the opportunity to play with a 5K monitor, so I don't know if
I'd be able to spot any differences.  I keep on promising myself I'll do a
few tests with 4K images vs. standard HDTV resolution and see if it makes
much of a difference.  I know that the biggest difference I see between a
regular Blu-ray movie and a 4K movie comes from the extra HDR color space
when I watch them on our (Sony OLED) 4K TV, but I might be able to spot
other differences with a still image.

On Windows it's possible to have the background slideshow resize images as
necessary to fill the screen, so a 2560-wide image wouldn't just be a small
rectangle in the centre of the display.  I'd expect IOS to be similar.

On Sat, Jan 01, 2022 at 12:23:50PM -0500, Mark C wrote:
> HI John -
> 
> Glad you liked the photo. What resolution of images do you use in your
> screen saver? I always wonder how my photos look on others' displays. I'm
> using a 2560x1440 resolution monitor and my web images look OK on it, but on
> the higher res 5k's or whatever, they may just be plus sized thumbnails...
> 
> Mark
> 
> On 12/24/2021 9:33 PM, John Francis wrote:
> > On Fri, Dec 24, 2021 at 11:05:40AM -0500, Mark C wrote:
> > > And best wishes for the new year!
> > > 
> > > https://www.flickr.com/photos/markcassino/51773061684/in/dateposted/
> > > 
> > > Mark
> > I don't comment on photographs as often as I probably should, but I do
> > have to say how much I like this one.  In fact my first thought was
> > "I'd love to have an image like this in my screen-saver rotation, but
> > I don't have anything suitable".
> > 
> > Then I thought a little more about this, and wondered if there was any
> > way we could set up a PDML trading post.  Somwhere where we could put
> > up a gallery of images we'd be happy to offer to other PDML members
> > for their own personal use at higher resolutions than we'd generally
> > make publicly available.
> > 
> > I've put together a selection of a dozen images from my screensaver
> > rotation at <http://www.panix.com/~johnf/PDML/Composite.jpg>. If
> > anybody would like one or more of these just let me know - I have
> > them currently at 2560x1440 resolution, which should be enough for
> > most people (if it isn't, just let me know - I have a few of them
> > at a bit more than that).
> > 
> > I haven't yet got a quick way of dropping a copyright marker on
> > these, but that shouldn't take me too long.
> > 
> > Oh, yes - Merry Christmas to all!  We're currently working in the
> > kitchen putting together various goodies to see us through the next
> > couple of weeks (we've got half a goose for our Christmas dinner).
> > --
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