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Is there a difference between ps signature and copy signature?
Scanning signature is prone to problems such as blurred image, irregular noise and long dark line, which Photoshop can handle.

1. Open the scanned image file in Photoshop.

2. Use a brush, choose a background color, and cover up the big noise.

3. Image-Adjust-Color Scale, adjust the color scale button to achieve the effect of black and white.

For a blurred image, you can use Filter-Sharpen-USM Sharpen, which may make the blurred image appear clearer.