Posted by Gary Wooding on 02/07/2021 07:10:11:
I use a free program called Irfanview (https://www.irfanview.net/) to view, edit, resize etc all photos when I put them on my computer. I've used it on all versions since Windows XP. It's very simple to rotate photos and does a pretty good job of simple editing. Give it a try, you won't be disappointed.
Or almost any photo editor will do the trick. I use gimp, but wouldn't recommend it for just this purpose because it's so complicated!
The underlying problem is digital cameras and computer software have no natural frame of reference to decide what's up or down in portrait or landscape. Cameras record their best guess by setting several indicators inside the image, and computer software might not use all the clues when displaying the image. So rotation data is sometimes lost in translation as images move from camera to computer, between computers, and back over the internet.
The cure is to edit images before uploading them. When a human being tells an image which way is up, all the indicators in the image obey the order, and any ambiguities are removed.
Bit of a pain to do. Moderators can rotate pictures in posts, but not albums, and I usually rotate any wrong 'uns I see. I can do requests too! Rotating is slightly dangerous because every so often it upsets the rest of a posts formatting, which takes time to correct. So I don't rotate unless I've got time to fix any collateral damage as well!
Dave