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One day, I opened my phone and noticed my wallpaper has changed.

I also noticed there was a note in front of my phone.

I read the note, saying:

Your phone has been hacked.

I changed the lock.

You must do a specific task.

The clue is hidden in the wallpaper.

What do I do?

slime

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Looking at the RGB channels, I noticed that

the green and blue seemed random, but the red channels seemed to have a pattern.

If you

overlay a red filter onto the image

you get this:

enter image description here

This clearly has a message in it: by replacing the pixels that are "extreme" colors (either all black or all red) we get this image:

enter image description here

and finally, shrinking it down gives us the intended message:

enter image description here
CLICK TOP RIGHT TEN TIMES AND PRESS HOME.

(Or you can just check the metadata, as nathoenk did while I was making this...)

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  • 1
    $\begingroup$ Upvoted for your last line! :-) $\endgroup$ – Phylyp Apr 27 '18 at 5:19
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    $\begingroup$ Hmmm. I just stared at the image until I convinced myself that I saw a cat in a pirate hat.... $\endgroup$ – Snow Apr 27 '18 at 15:21
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The answer is

CLICK TOP RIGHT TEN TIMES AND PRESS HOME

explanation

Since I don't have photoshop, I open file via online inspector and found that sentences at Text Layer Name and Text Layer Text. So I conclude that answer hidden at layer name. This screenshot from online inspector. enter image description here

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