bytedeco/javacv

How to add a transparent background image to opencv_ core.addWeighted

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#1,912 opened on Oct 27, 2022

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Description

How to add a transparent background image to opencv_ core.addWeighted; At present, transparent parts in transparent pictures are filled with white;
I want to get the reversed color through mat, but I can't find the corresponding method, similar to Core bitwise_ not(coreMask, coreMask);

Contributor guide

Research direction
Study the OpenCV addWeighted documentation and JavaCV examples for handling transparency. Look for methods to extract and invert alpha masks using Core.bitwise not.
Tech stack
java
Domain
api
Issue type
Research
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaOpenCV
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70