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Adjust photo size with Photo editing software Photoshop
Basically, with my Nikon D7 I shoot a large jpeg, and the image size in photoshop becomes about a 6x10, at 300 dpi. I need to make 16x20's from these files, how do I do this without messing up a good resolution for printing. 
-Do I just go ahead and increase the size while keeping it at 300 dpi? Or will this pixilate the image? 
-Do I link all the options (dimensions and resolution) and get a lower resolution? 
-do i keep "resample image" and "constrain proportions" both checked? 
Im using photoshop 7 
Thanks in advance!
RE:
By D7 you mean a D70, right? That is a 6.1 megapixel camera. So read the following statement well and memorize it: 

Whatever the resolution and size of your image, it will have 6.1 megapixels. Period. 

This is critical to understand, because resolution simply determines how densely those pixels are packed together, and the image dimensions will follow. In otherwords, for a finite number of pixels, you will produce a larger image with a lower resolution (ppi) and a smaller image with a higher (i.e. denser) resolution. 

So the image out of your camera is 3008 x 2000 pixels. This is a 2:3 aspect ratio (the dimensions of the picture), which will produce 4x6, 8x12, 16x24, etc images. If you want to print a 16x20, you will need to crop your image to 4x5 instead of 4x6. So this will leave you with a 2507 x 2000 pixel image, or 5.0 megapixels. 

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