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In Adobe Photoshop CC, say that we have filled some shape with white, how can we fill the rest of the image with black? In other words, how can we make a binary image?
First of all. Shortkey D makes your foreground pure white and background color pure black. Shortkey X switch them.
So, just select necessary layer or shape of your project and press shortkey Alt + Backspace. It will fill it with foreground color.
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