This is all confusing to me. Resolution is directly related to the image size in pixels. Look at the height and width dimensions.
When you change ppi (pixels per inch) that will determine the documents size, provided you do not resample image when changing.
So you probably should do a little research on this as it can get complex. Your friend's number do not make any sense to me.
the hight and width is almost identicle if you compare at the diference between 30x80 at 300pi, and 29,99x80,05 28,346pi
How she got this resolution must had been becuase she accidently resized her first file from 30x80 at 300pi, looks like a very small diference accept its a huge diference between 28/29pi and 300pi which at 300pi the image is huge, i just put her layers in a folder/group and changed the resolution for everything in it.
I don't know what pi is. You are using it two ways in same sentence. It is 30 x 80 p (pixels) at 300 ppi (pixels per inch)
You can change the resolution, but remember you can not add detail that is not there.
So if you change the resolution without resampling (check box at bottom of Image Size window) you will see the pixel size remains the same and the document size changes.
If you do the same thing and check resampling the image size will change and the document size will not change. If you change resolution from 100 to 300 it does NOT mean you have 3 times as good of resolution. It means photoshop as added pixels as a best guess logarithm. Actual resolution may be a little worse as there is no free lunch.
As I said before it can get confusing.
i am aware about the resolution situation, everything is already 1920x1080 and shot on a canon 5Dmkiii, im changing it for printing tests
and yes PPI is what i meant, i just wanted to know if there was a way to change the resolution but restrain the size do i did not have to re transform the the images, even though it says 300PPI and 30x80 xhen i dragge dthe layers on to my from hers they are huge now and i have to Tranform them manually