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When you open the photos from your Nikon are the images at 72ppi to start with? What version of photoshop do you have by the way?

Simply put, a photo at 72 dots per inch will take up more room physically in inches since there are only 72 dots per inch. When you change it to 300 dots per inch the photo will be physically smaller since your now compacting more dots per inch.

Example: An image from a 8mp digital camera that is 3504x2336 pixels total size at 300dpi is 11.68" by 7.787 inches. You take the total size of the photo divided by the resolution ppi, so 3504/300 is 11.68 and 2336/300=7.787 inches.

Now the same photo 3504x2336 at 72 ppi would be 48.667x32.444" inches big!! 3504/72=48.667 and 23336/72=32.444

So in image resize dialog note your total image size in pixels, lets say 3504x2336, change the resolution or ppi to 300, Photoshop will change the total image size, go back up to the size in pixels and change it back to what you noted. Done.

Dave K
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