>I just tried making a new file, and set it at 8x10x300dpi. When I
>dragged the original untouched photo to the new "frame", it was smaller
>than usual.
Corrct. Of course it was.
Think about this for a minute: A picture in Photoshop is nothing but a grid of
little tiny squares. Each square is a pixel.
A picture that is 8 by 10 at 240 pixels per inch is 1,920 pixels wide and 2,400
pixels deep. A picture that is 8 by 10 at 300 pixels per inch is 2,400 pixels
wide and 3,000 pixels deep.
You have a grid of little tiny squares. It is 1,920 pixels wide and 2,400
pixels deep. You drag it into another grid of little tiny squares that is 2,400
pixels wide and 3,000 pixels deep. It will not fill that second grid of
squares. There will be 240 pixels of empty space on the top and 240 pixels of
empty space on the bottom, and 300 pixels of empty space on the left and 300
pixels of empty space on the right.
A pixel is just a square of color. Think of a picture as a tile mosaic. Each
tile is one pixel.
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