You can add Custom Document sizes to Photoshop

You can add Custom Document sizes to Photoshop:

Print sizes and image resolutions

Ok
4x5 800x1000 at 200 ppi
8x10 1600x2000 at 200 ppi
16x20 3200x4000 at 200 ppi
24x30 4800x6000 at 200 ppi

Good
4x5 1200x1500 at 300 ppi
8x10 2400x3000 at 300 ppi
16x20 4800x6000 at 300 ppi
24x30 7200x9000 at 300 ppi

Screen Resolution Image Resolutions

HD 720
1280 px X 720 px 72 ppi

HD 1080

1920 x 1080 at 72 ppi
or smaller with a ratio of 16:9

2k 1080
1080 x 1280 at 72 ppi

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