You can even make your own using Preview‘s lesser-known Instant Alpha feature. To avoid this, you will want to make certain your item is transparent (meaning any part that is not the actual image is clear and not set to another color)–PNGs typically have the alpha channel enabled. This is part of the image where the alpha channel was not completely removed. Notice on the last two screenshots that there is some white area in the images. Take a look at some of the examples below of what I set my login window logo to: This article will describe how to do that. I liked the grey background, but just wanted to replace the logo. Unfortunately, this also got rid of the Apple logo.
This trick could also work with organizations looking to brand their Macs with their logo.Ī while back, OS X Daily showed how to replace the grey-colored background with your own wallpaper. Replacing the default Apple Logo with your own is a great way to customize OS X.
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