No, don't do the marquee thing. It's limiting yourself too much later, in terms of print shapes. Take the time to mask the background around the WHOLE horse.
Gosh yes, when you print a photo that tiny, it forces you to examine it much more closely than a larger photo. I'd say you're noticing the printing dots that have always been there, you've just never looked closely before.
I'm running Win10 on heaps of devices here, and all are going beautifully.
I know some people have reported problems, but I haven't experienced them. I don't miss Windows 8.
It sure is mysterious. Everything you've shown us indicates that your files should be in RGB mode ... yet we can't deny the evidence in front of us - the files you first uploaded are definitely Grayscale mode.
Hi Wendy,
Banding is a little tricky to diagnose, but stick with me. I'm going to ask you a series of questions so we can get to the bottom of it.
First, I need you to tell me what screen you have.
(By the way, no, don't repaint. White is perfect.)