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ImageBlend ran the blend maths over every channel, so for RGBA inputs the alpha was blended as if it were colour. In difference mode two fully opaque images produced 1.0 - 1.0 = 0.0 and the result came back completely transparent. Keep image1's alpha, which is the base being blended. CORE-392
Pytest Unit Tests
Install test dependencies
pip install -r tests-unit/requirements.txt
Run tests
pytest tests-unit/