What is alpha in RGBA?

Related questions

1. What is Trimap?
2. What is image matting?

Tags

1. #opacity
2. #green
3. #alpha
4. #specifies
5. #value
6. #parameter
7. #number
8. #transparent
9. #opaque
10. #extension
11. #specified
12. #color
13. #between
14. #channel
15. #which
16. #fully
17. #values