Why, when I paste my selection in a new layer, is it 10 times larger than when I copied it?

Question

Why, when I paste my selection in a new layer, is it 10 times larger than when I copied it?

Answer 1

Kevin If you don't understand don't try to take the discussion offline via private message.  Other that have the same problem will not benefit if taken offline here is you PM.
Hi,
Thanks for your response to my question. What is the best way to adjust to match resloutions of pictures/photos, etc in PSE 12. I am trying to layer photos and selections from photos but when I cut and paste, sometimes I get this HUGE image that doesn't even come close to fitting on the screen.
Thanks!
Kevin
Kevin
You need to understand pixels better know what is going on when you do things.  All pixels are not created equal.  Some have better quality the others.
When you have a camera that take captures  3000x2000 px for an image and you have a good lens and exposure setting you wing up with 6,000,000 quality pixels for your image.
If you resample that image  for the web to fit within 300x200 pixels you wind up with a 60,000 high quality web size image. Or a high quality image that will fit on your display at its resolution. The images resoultion setting is meanless for displays use their resolutuin they do not support image print DPI resolution setting.  And Displays do not hava a 72DPI resolution. 
So when your post processing think about Pixels DPI is meaningless except when you use a unit based on DPI like inches.  However also remember Displays do no support the images print dpi resolution.  The only time 1" on display equal 1" in print is when the images print resolution is the same as the display you are using. All displays do not  have the same resolution/ Most desktop displaye are around 100DPI that is changing and Laptop and tablets can have resolution above 300DPI. So what will nor fit on your displat may well fix on a laptop or tablet.
DPI is actual pixel size 100DPI pixels a 1/100" x 1/100" = 10,000 per square inch  300DIP 1/300"x 1/300"  90,000 px per sq inch.
The same number on pixels image on a 300dpi display is 9 time larger on a 100Dpi display. What may not fit one your low resolution display may fit on the same size high resolution display for the display  displays more pixels then your display can.
If you resample that 300x200 web size image to back to a 3000x2000 pixel image for print you wind up with 6,0000,000 lower quality pixels. 
Though the 300X200 pixels image was a high quality web size image much of the original 6,000,000 image quality was reduced in the 300x200 px image. Much of the detail you had in the original 6,000,000 pixels image was discarded in the process.  The new 6,000,000 pixels image was made only from a 60,000pixel image they were not captures using a camera exposure.  The camera had the actual real detail in front of it to capture.  All the computer had were 300x200 pixels it has to add details for the larger image and it does by interpolating the 300x200px image.
Preserve the pixel you get from your cameras. They are the highest quality pixels you will ever have for your images.  Every time you resample an image up or down in number of pixels you loose some image quality.   Not one of the original pixels remain intact you wind up with a totally new image created by interpolating the old image.  Do not save the new image over the old image and loose your good high quality pixels.