DPI by itself is completely meaningless in digital photography. Suppose you have a camera that takes an image that measures 4000 x 6000 pixels. Regardless of whether the DPI is 240, 300, 600, or whatever, the image is still 4000 x 6000 pixels. Changing the DPI setting by itself, and doing nothing else as far as size is concerned will have literally no effect on the quality of your image.
It is much more important to understand how to determine how large of a print you want to create. If you want to create the largest print you can from the aforementioned print size at 300 PPI (not really DPI) then you need to understand the calculations:
4000 pixels / 300 PPI = 13.3333 inches
6000 pixels / 300 PPI = 20 inches
So if you have an image with that many pixels and you want it printed at 300 PPI then you will have a print that is 13 x 20". And it doesn't matter what the PPI setting is. That setting does not change anything as far as size or quality is concerned.
So if my image is 4912 x 3264 pixels (240 dpi // 13 x 20 inches) you are saying that I can print a 13 x 20 inch image with no problem?
So interesting! I never knew this and I work with printers on a daily basis.
I hope I am understanding you correctly.
PPI or pixels per inch, not DPI
4912 pixels spread across 20 inches is 245.6 pixels per inch (regardless of what the PPI number in the file says, the number in the file can say 300 or 72 and your image will still print at 245.6 pixels per inch). Of course, you probably want to crop your image to 20x13, otherwise the printer will do the crop for you.
Yes, that is exactly what I'm saying.
Do you by any chance know if the library module automatically saves the photos? Just in case I wanted to go back and make other edits?
Thank you very much for your help, Jim. I really appreciate it.
Your photos and edits are automatically saved in Lightroom, there is no action you need to take to accomplish this saving of edits. If you return to Lightroom at some future time, your edits will be there. Do not delete the photos from Lightroom, this can cause you to lose your edits and metadata.
I have never deleted a photo from Lightroom (purposely). Do I go into the Library module and they will just appear or are there further steps I need to take to find them?
Your edited photos remain in Lightroom. To find them the next time you go into Lightroom, you might have to scroll up or down, or select a folder or keyword to help you find the photo of interest, as Lightroom will only display a small portion of your Library at any one time.
Excellent, thank you. I'm not sure what keywords to enter because I never tagged them, but hopefully I can find what I am looking for. I'm new to using Lightroom and clearly should have read more about the catalog / library feature before using it.
Thank you for your help!