associative alpha #49
Merged
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This updates the alpha blending formula to match a formula found in a blog post that is associative and proves it. This also updates batteries to v4.14.0 and adds mathlib v4.14.0 as a dependency. This way we can import mathlib for the linarith tactic that is useful for proving that alpha blending is associcative. We also update the screen size for image denotation so we can see the FPS
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
In this blog post https://ciechanow.ski/alpha-compositing/#compositing-done-right we found that alpha composting or blending is associative via the formula
R = S + D × (1 − S_a)
where
R = result
S = source
D = destination
This commit updates the alpha blending formula to match the formula found in the blog post that is associative and proves it.
This also updates batteries to v4.14.0 and adds mathlib v4.14.0 as a dependency. This way we can import mathlib for the linarith tactic that is useful for proving that alpha blending is associcative.
We also update the screen size for image denotation so we can see the FPS