High resolution photos will be identified by a blue background.

Most will be 3000 X 2000 or 3000 x 2250 pixels.

Please note that the hi-rez photos (usually 3000 x 2000, or 3000 x 2250 pixels at 72 dpi- approx 12" x 16") can be converted to a nice 6.5"-7.5" x 10" at 300 dpi in Photoshop's Image/Image Size fields. Some where taken at 180 dpi, but the following method will work the same in this simple 3 step way:

1.  Open image in Photoshop. Go to Image/Image Size on the tool bar.

2.  Note the pixel size of the width, then change the dpi to 300. This will increase the pixel and image size considerably (not good at this stage)-

3.  Then change the pixel number of the width back to what it was before you changed the dpi. this will give you a decent printing quality image.

FWIW: Any of the med.-rez photos, 1024 x 768 (10"x14") at 72 dpi can be changed to a decent 300 dpi  (2.5" x 3.4").  With the same method. Small, but they will print very nicely. This is offered in the "for what it's worth" category.

There probably a similar set of steps in Corel's Paint Shop Pro.