So first things first, get your png and background, and since we have a post-apocalyptic feel to this cover, we have a dark background! Tip: choose a color scheme that matches your theme! Don't pick a bright background for a book about death!
Okay, after that, open PicsArt and place your background and PNG. Then open Polarr. Use the "void" filter in the resources section. Just take a screenshot of the QR code, then pick the little line on the screen with the white dot, Import From Photos. Then choose the screenshot.
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Okay so after that use the dimensions that you can see in the screenshots below. Warning, I sharpen A LOT but you can always change the dimensions if you don't like how they look!
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(Haha I made him sunburnt)
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Okay but seriously.
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I only changed the contrast and exposure for the next part.
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Okay and then go into Polarr. The background is black, so I made the actual font black and then I went into STYLE which is the shaded button on the top of the screen. After that I clicked the white to get another shadow effect.
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Here's the finished product:
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