: Measuring minimum resolution in Photoshop/GIMP I am following Apple's iTunes connect guide (as of today 13th November 2013) for designing an image. At page 239 of their guide I am confused on

@Turnbaugh909

Photoshop layers are all controlled by a single ppi setting.

When creating a new document, you are asked what PPI (Resolution) you want the document to be set at:



If you are working on an existing document, the PPI setting can be found at Image > Image Size... in the menu:



Note that if you change the PPI (Resolution) setting with Resample Image unchecked you will see a change in the width and height of the image as well.

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@Looi7658678

The image size does not depend on pixel dimensions but it determined by the dpi value the images will have on the output device. For a computer monitor this will typically be 72 dpi which is the default setting in most graphic applications. For print output other dpi values may be needed.

These settings can be made or looked up in Gimp with the Image > Print Size... dialog:



Note that depending on image size there may be rounding errors in the value displayed. Also note that after we changed the dpi setting in Gimp all newly created images will also have these settings. We therefore will have to change them back to defaults after we had saved our image.

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