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From what I understand, DPI is a printer resolution....it will set 300 dots of ink per inch (DPI) for an image regardless of how big the image is, 3x5 inches or 3x5 miles.
On a screen you don't want to have an image resolution that is significantly less than the resolution of the screen, otherwise it will get all blurry if it is expanded to fullscreen... so a 20x30 pixel image would look like crap if it was blown up to 100% of a 1264 x 1680 screen.
Thus, use a good high-resolution image that looks good on your target devices...but don't overdo it unnecessarily ... no need for a 6000x10000 pixel image if it will only be displayed on a phone with 720p.
I personally use about 1600px high images for images intended to take up the full screen inside the book....and about 2200px high for a cover image.
Last edited by Turtle91; 08-03-2024 at 07:41 PM.
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