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Remove the white of the scanned paper

New Here ,
Nov 19, 2022 Nov 19, 2022

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Hello everybody,
How do I remove the white of the scanned paper, leaving only the drawing and writing?

 

In the attachment, the file

Thanks for the advice, Pier

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macOS , Windows

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Community Expert ,
Nov 19, 2022 Nov 19, 2022

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Have a look at "Blend if" – here's an excellent online tutorial:
https://www.youtube.com/watch?app=desktop&v=bte8bBY57U8

 

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Community Expert ,
Nov 19, 2022 Nov 19, 2022

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There's probably no need for any masking or selection here.

  • fix the uneven lighting.
  • set the white point.

 

That's most likely all it takes (and the final result will look better and more credible).

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Community Expert ,
Nov 19, 2022 Nov 19, 2022

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A quick way is to apply Levels and reduce the white point, as shown.

 

Photoshop Remove scan background with Levels.gif

 

Derek’s BlendIf suggestion will be better if you need to feather the adjustment. It will be easier to preview BlendIf if you either add a white layer behind the scan, or disable the checkerboard transparency background.

 

Photoshop Remove scan background with BlendIf.gif

 

But you see that both have a problem in that the light gray paper tones, especially in the wrinkles, are shared by some of the lighter tones in the drawing, so white point adjustments using Levels and BlendIf both end up removing some tones in the drawing. To solve this, re-scan trying a higher exposure, and also, put a book or other weight on the scanner lid to remove the wrinkles from the paper during the scan.

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Community Expert ,
Nov 19, 2022 Nov 19, 2022

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This is great fun, @Pier27218397vq74! To add to the other excellent suggestions, as a quick text for myself, I started with the “blend if” using a white fill layer behind your original scan. Then, I saved that result to a new file and flattened the layers, adding the original scan below. I used a layer mask to bring back in the detail and colors on the fruits and used a soft brush around the chef and pizza, which could certainly be blended more to look better with some time.

 

JEL_0-1668889164377.png

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