It’s quite common to scan or photograph something on a sheet of white paper and bring it into Photoshop. Here’s the easiest way to make the paper transparent without using selections. Simply choose the Multiply blending mode in the Layers panel. This will make the white invisible. If you can still see the paper faintly, press Command-L (PC: Ctrl-L) to launch Levels. Slide the white triangle below the histogram to the left to make the white disappear completely.
This tip originally published in Colin Smith’s Photoshop Tips column, in the July, 2022 issue of Photoshop User magazine.
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