How do I size a 8x10 photo 300 PPI?

TheFotografist

New member
Here's the instructions:
Prepare your files as follows: sized to 8x10 at 300 PPI, in any imbedded color space and saved as a baseline standard, level 10 JPEG. Any B&W images also should be in RGB, not Grayscale.

I don't have photoshop so I'm not sure how to do this..?
 
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