Ok I didn't say anything before because I was to tired to answer this thread and make sense. And I hope no one gets mad at me for this post too but there seems to be some confusion.
dpi = dots per inch yes
ppi= pixels per inch
when you are talking in terms of resolution for scanners and printers they speak in terms of dpi resolution but when you are talking in terms of digital images and resolution in photoshop and other image programs that is ppi as it is viewed on your monitor. I know that it is very similar names and it is confusing and don't ask me why they use that term for scanners i think they should do it as pixels cause that's what you end up with on your screen when you scan.
but In ps you will see that when creating or opening a new image the resolution is visible reading at # ppi.
Well here's where you go wonky with the fuzzyness in print. If you dont' make sure you start with 300 ppi ( it's a good practice to just always do 300 if you think you will print be it on your home printer or professionally)
pixels can shrink and enlarge. so if you have a document that is 12 in x 12 in and you have it set at 72 ppi then the pixels are going to have to be bigger in order to fill the space ( get me so far?) so you're going to see fuziness and jaggies and maybe even little square blocks of color which is refered to as pixelation ( i know i can't spell)
However if you start at 300 ppi your pixels are going to be small and you will use much more of them to fill that 12 x 12 space and that will result in better sharpness and higher definition of your print.
SO you're probably saying to yourself does that mean that i can make it 600 ppi and it will be even better!!!?
Well yes and no. Most printers will only print up to 300 ppi. There are some exceptions in professional printing and you may want to check with your print press before creating documents and see if they recommend a higher resolution or are capable of higher resolutions; but for the most part NO dont' bother. It will be a bigger file and 300 ppi is considered up to par with photographic quality.
Well what happens if you have a 72 ppi and change it to 300 ppi you ask?
That's called resampling and in general will only get you a blurry/ fuzzy image with a much bigger file size for no good use what so ever. There are techniques to resample photos that are quite successful but I wouldn't recommend doing it on elements or layouts. I was actually working on a tutorial for this for those of you that didn't want to pay $100 + for the lizard tech plugin.
So there you have it my explanation of resolution in terms of pixels per inch.
( this explanation I have learned myself from reading a " few" books on the subject of digital imaging and printing. )
I certainly hope that helps you feel free to message or pm me if you need further assistance)
Tanya
