Okay so I haven't really printed out that many of my photos (just slackness on my part). I'm going to get a batch printed soon, and was just wondering what the best settings are. For example, printing in 6x4", is it necessary or optimal to resize the original photos (jpg's converted from RAW) or will it not matter? The way I was thinking about it, if I use 300dpi resolution on the lightroom export settings, then 6x4" would ideally want a size of 1800x1200 pixels - is this reasonable logic? If I do or don't resize will I see any difference in sharpness in the final pics?