Interesting. Exactly the same wallpaper has white digits and letters on my iPhone.Here's an example of one of the included Apple backgrounds that produces a non-white clock/calendar display. This one doesn't look black, more like a gray, but that may just be an optical illusion that tricks the eye against that particular background. I don't know what the criteria is that determines it. No apparent rhyme or reason.
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I’ve tried the same wallpaper on an iPhone SE running a Public beta version, and on my iPhone X with 11.2.2 installed. It was the same on both devices.Well that's interesting! Are you on 11.2.2, or on a beta? Or I wonder if it makes a difference which model of phone you're using?
I’ve tried the same wallpaper on an iPhone SE running a Public beta version, and on my iPhone X with 11.2.2 installed. It was the same on both devices.