I might want to generally target the highest iPad resolution, and I can easily do that by setting my document up as 2732 px x 2048 px (iPadPro), and make sure any placed images do not fall below an Effective resolution of 72ppi. The Pixel unit is a convenient, and easy way to a specify a pixel dimension when exporting without doing any complex math calculations. If this is a 288 ppi image of 144 x 144 pixels its size is actually 0.5 inches by 0.5 inches, and that's the size used to place it.īottom line: if you want to imagine you are designing in pixels that's fine, but you have to allow for InDesign actually working in inches, and set things up so it works for you.īut ID can also be used for screen designing, and the reason for the Pixel measurement unit is, any page destined for a screen will have to exported-JPEG, PNG, PDF, ePub, raw HTML. So, if you place a 72 ppi image of 144 x 144 pixels it is actually 2 inches square as well and fills the page perfecly. The size in inches/mm is used to place it. When you place an image its size in pixels is ALSO IGNORED. So, suppose you size a document as 144 x 144 pixels. The size in pixels is immediately forgotten and has no effect on anything else you do. So, what happens when you size a document in "pixels"? It just assumes a pixel is 1/72 inch. The ONLY time InDesign looks at pixels is to report resolution, it has no other impact on what ti does. And images also only have size in inches/mm. It's clear why you feel that you can, but InDesign is a print tool. The crucial thing is that you CANNOT SIZE AN INDESIGN DOCUMENT IN PIXELS.
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