opening digital pictures

I have a question about opening my digital pictures in photoshop. I shoot at 7.1 mp. I keep them in jpeg format. They open at 72 dpi. When I resize the image I change the resolution to 350 dpi. I usually resize to a 4 x 6 or 5 x 7. My question is how large of an image can I get at 350 dpi? If I type in 350 dpi for resolution it stays that way no matter what physical size I change the picture to. Now I oviously can’t change my 72 dpi image to a 350 dpi image without changing the physical image size, but one time I forgot to change the size and hit ok. When I went back into the picture it said it was a 350 dpi image and it wasn’t. I guess what I need to know is, is there a scale of some sort that lets you know how many dpi fit as you reduce the size of your image when it starts at 72 dpi. I hope I explained this correctly.
Thanks, Tammy

I have a question about opening my digital pictures in photoshop. I shoot at
7.1 mp. I keep them in jpeg format. They open at 72 dpi. When I resize the
image I change the resolution to 350 dpi. I usually resize to a 4 x 6 or 5 x
7. My question is how large of an image can I get at 350 dpi? If I type in
350 dpi for resolution it stays that way no matter what physical size I change the picture to. Now I oviously can’t change my 72 dpi image to a 350 dpi image without changing the physical image size, but one time I forgot to change the size and hit ok. When I went back into the picture it said it was a 350 dpi image and it wasn’t. I guess what I need to know is, is there a scale of some sort that lets you know how many dpi fit as you reduce the size of your image when it starts at 72 dpi. I hope I explained this correctly.

I have a question about opening my digital pictures in photoshop. I shoot at
7.1 mp. I keep them in jpeg format. They open at 72 dpi. When I resize the
image I change the resolution to 350 dpi. I usually resize to a 4 x 6 or 5 x
7. My question is how large of an image can I get at 350 dpi? If I type in
350 dpi for resolution it stays that way no matter what physical size I change the picture to. Now I oviously can’t change my 72 dpi image to a 350 dpi image without changing the physical image size, but one time I forgot to change the size and hit ok. When I went back into the picture it said it was a 350 dpi image and it wasn’t. I guess what I need to know is, is there a scale of some sort that lets you know how many dpi fit as you reduce the size of your image when it starts at 72 dpi. I hope I explained this correctly.