Let's say we have a file called telephone_pole.jpg.
telephone_pole.jpg has the pixel dimensions of 3008 x 2000.
The file doesn't have a size, yet.
It won't have a size until a resolution value is chosen.
Let's "tell" the pixels in telephone_pole.jpg how big to be.
We'll give it a resolution of 200 pixels per inch.
White dots are used below to represent the size, or concentration, of the pixels.
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200 ppi
The Pixels Are Larger - Less Concentrated
The 200-ppi version of telephone_pole.jpg is large because we told the pixels to be larger.
Now let's change the size of telephone_pole.jpg.
Let's change the resolution from 200 ppi to 300 ppi.
| ............ |
| ............ |
300 ppi
The Pixels Are Smaller - More Concentrated
The 300-ppi version of telephone_pole.jpg is smaller because we told the pixels to be smaller.
telephone_pole.jpg at 300 ppi resolution . . .
300 ppi
. . . is smaller because the pixels are being squeezed into a smaller space—300 pixels per inch.
The 200-ppi version of telephone_pole.jpg is larger . . .
200 ppi
. . . because the pixels are being spread further apart—only 200 pixels per inch.
You can play with resolution by using the Pixels, PPI, & Print Size Calculators.
Enter the pixel dimensions of your photographs, such as 2000 x 3000.
Then, enter different resolutions to see how the print size changes.
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