In previous chapters, you used images for selections and there was not that much difference in the images. Whether it is a tab bar or the menu for the iPad, using a different image to indicate a selected state helps make things obvious. It is also good to show those using the right tint from the app color scheme.
There are two main parts to making selected images that use a custom tint work:
Set the highlighted image.
Update both images to use the template rendering mode.
The first part is adding images for the selected state: ...