To use this image in a book, the largest size it could be printed at is 2″ by 1″. 600 by 300 divided by 300 = 2 by 1, so the largest size this image can be printed at is 2″ by 1″. Here’s an example: The image below is 600 by 300 pixels. Yes, that’s right: The size your image is viewed at determines its resolution! Using math to determine maximum printing sizeīecause images need to be printed at 300 ppi, there’s a quick and easy way to determine the maximum size that an image can be printed at: simply divide the number of pixels in the image by 300. Every digital image is made up of pixels (squares of color) and the size the image is viewed at determines its resolution. But first, a brief explanation of resolution. There are two ways to find out whether the resolution of an image is high enough to print at the size you want: using math and using Photoshop (I’ll explain both). How do you figure out the size of an image, and whether or not it’s suitable for printing? How can you determine whether an image file is high enough resolution to use in your book? That’s a question I get asked all the time! Images should be at least 300 ppi (pixels per inch) at the size they’ll be printed at- and that’s where most people need help.
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