What is a gimp mask used for?

Related questions

1. What's a gimp mask?
2. What program do photographers use to edit photos?
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4. Can I buy Photoshop without a subscription?
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6. Do photographers use Photoshop?
7. What is Gimp in Ubuntu?
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9. Is Lightroom or Photoshop better?
10. What is the difference between Gimp and Photoshop?

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