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Understanding Resolution

Understanding Resolution

Understanding how the dimensions of a digital photo relate to what comes out of a printer is hard. That’s why iPhoto merely alerts you with a warning icon when a photo won’t print well at a specific size. Read these two pages to learn why iPhoto displays warning icons; “Dealing with Warning Icons” in Chapter 7, “Troubleshooting,” offers help.

Pixels and Dots

Every digital photo is made up of a rectangular grid of points, called pixels, each of which can display one of 16 million colors or several hundred shades of grey. For instance, photos from my camera are 1600 pixels wide by 1200 pixels high. Monitors also display rectangular grids of pixels, often 1024 pixels wide by 768 pixels high.


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