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Remove background in all captcha image with Adobe Photoshop

How do I remove the background of captcha images using Adobe Photoshop?

The letters and numbers shall be recognizable by OCR. I want to create an action in Photoshop that can be used for all captcha images.

Example captchas:

pic1pic2pic3 pic4pic5pic6pic7pic8pic9pic10

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2

Answers


  1. 0
    1. Make a adjustment layer Black & White.
    2. Duplicate layer and change order to first.
    3. Change blend as Color Dodge.

    Layer

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  2. 0
    1. Duplicate layer and change order to first.
    2. Change blend as suitable one

    enter image description here

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