The best

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Across
  1. 4. Area of lightest value in an image
  2. 5. Intensity or purity of a color
  3. 7. Level of transparency of an object
  4. 8. Technique to hide or reveal parts of an image
  5. 11. Ability to see through something
  6. 13. Difference between light and dark areas
  7. 14. Color mixed with black
  8. 16. Correction of color temperature
  9. 17. Adjustment of color intensity
  10. 19. Area of darkest value in an image
  11. 20. Method of combining layers
Down
  1. 1. How light or dark a color appears
  2. 2. Mask that uses one layer to control another
  3. 3. Blend mode that darkens colors
  4. 6. Color mixed with white
  5. 7. Blend mode that combines multiply and screen
  6. 9. Smooth transition between colors
  7. 10. Channel storing transparency information
  8. 12. Color mixed with gray
  9. 15. The pure form of a color
  10. 17. Circular diagram of colors
  11. 18. Editable mask attached to a layer