John,
But the image has been downsized! This arose because the image I quoted was displayed in a photography competition using PowerPoint 2010 and there are so few pixels that it was absurd to display it full screen even though the pixel dimensions or the original image were quite adequate. However, I am beginning to believe that this is perhaps an issue between Adobe and Microsoft because I tried IrfanView which permits me to change the resolution without changing the pixel size. However, both Adobe and PowerPoint 2010 continue to treat the changed file as still having the original 2800 ppi resolution. Most other cheapie systems I have tried regard resolution as something only to estimate a future print size and only IrfanView seems able to even record a change and show it again upon reload.