diff options
author | Philipp Oeser <info@graphics-engineer.com> | 2019-07-31 13:22:42 +0300 |
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committer | Philipp Oeser <info@graphics-engineer.com> | 2019-07-31 17:29:51 +0300 |
commit | 8dd95abb2ff9160d95808507f70b4233546e9f65 (patch) | |
tree | 700fdc494ab01e531b383342ac21c2221c456c40 /source/blender/compositor/operations/COM_BrightnessOperation.cpp | |
parent | 200c9f37d64a4aac5bffde2f12ba4638af0a87b1 (diff) |
Fix T67808: Bright/Contrast node wrong for negative contrast
strange nobody noticed since 2012...
thx @jenkm for spotting
Reviewers: brecht
Subscribers: jenkm
Maniphest Tasks: T67808
Differential Revision: https://developer.blender.org/D5378
Diffstat (limited to 'source/blender/compositor/operations/COM_BrightnessOperation.cpp')
-rw-r--r-- | source/blender/compositor/operations/COM_BrightnessOperation.cpp | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/source/blender/compositor/operations/COM_BrightnessOperation.cpp b/source/blender/compositor/operations/COM_BrightnessOperation.cpp index 81df85daf28..d0bab5aa4d9 100644 --- a/source/blender/compositor/operations/COM_BrightnessOperation.cpp +++ b/source/blender/compositor/operations/COM_BrightnessOperation.cpp @@ -56,19 +56,19 @@ void BrightnessOperation::executePixelSampled(float output[4], float contrast = inputContrast[0]; brightness /= 100.0f; float delta = contrast / 200.0f; - a = 1.0f - delta * 2.0f; /* * The algorithm is by Werner D. Streidt * (http://visca.com/ffactory/archives/5-99/msg00021.html) * Extracted of OpenCV demhist.c */ if (contrast > 0) { - a = 1.0f / a; + a = 1.0f / (1.0f - delta * 2.0f); b = a * (brightness - delta); } else { delta *= -1; - b = a * (brightness + delta); + a = 1.0f - delta * 2.0f; + b = a * brightness + delta; } if (this->m_use_premultiply) { premul_to_straight_v4(inputValue); |