Graph: Bits Over Resolution In A Photoshop File

This graph gives how many MB are used for a Photoshop file depending on your resolution. Bits (in MB up to 1G) are on the left, the resolution is on the bottom from 1 to 300 pixels per inch.

The connected lines track same size documents (in inches squared) in 5" increments (10" square; 15" square; 20" square, etc).

At 300 PPI a 66.75" square would be 1.12 G.

At 200 PPI a 100" square would be the same.

At 100 PPI it would take a 200" square to reach 1.12G.

At 50 PPI, predictably 400" square.

At 1 PPI you could make a picture 20,000" square for only 1.12G.

At 300 PPI a 2"x2" document is about a MB.

At 50, a 15"X15" document is about a MB.

At 1 PPI a 1000"x1000" document is about 3 MB.