Opened 3 years ago

Closed 17 months ago

#8120 closed defect (wontfix)

blend filter, documentation

Reported by: Michael Koch Owned by: Gyan
Priority: minor Component: documentation
Version: git-master Keywords:
Cc: Blocked By:
Blocking: Reproduced by developer: no
Analyzed by developer: no


Summary of the bug:
The documentation of the blend filter doesn't explain any of the modes. A few modes are self-explaining, but most are not. Better explanations are required. Here are a few:

addition: Output is (A+B), with an upper limit at white level

average: Output is the arithmetic mean of A and B

subtract: Output is (A-B), with a lower limit at black level

difference: Output is the absolute difference of A and B

grainextract: Output is (A-B), shifted to 50% gray level with a lower limit at black level and an upper limit at white level.

darken: Output is the minimum of A and B

lighten: Output is the maximum of A and B

For all other modes I don't know how to describe them.

Change History (2)

comment:1 by Gyan, 3 years ago

Owner: set to Gyan
Status: newopen

comment:2 by Elon Musk, 17 months ago

Resolution: wontfix
Status: openclosed
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