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Implementing a fix for mask contrast proposed by GitHub user xotmatrix

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This commit is contained in:
Jonathan Thomas
2022-11-18 00:32:48 -06:00
parent 20e7fba572
commit fc7575b60e
1 changed files with 2 additions and 5 deletions
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7
src/effects/Mask.cpp
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@@ -114,11 +114,8 @@ std::shared_ptr<openshot::Frame> Mask::GetFrame(std::shared_ptr<openshot::Frame>
gray_value += (255 * brightness_value);
// Adjust the contrast
float factor = (259 * (contrast_value + 255)) / (255 * (259 - contrast_value));
gray_value = constrain((factor * (gray_value - 128)) + 128);
// Constrain the value from 0 to 255
gray_value = constrain(gray_value);
float factor = (20 / (20 - contrast_value));
gray_value = (factor * (gray_value - 128) + 128);
// Calculate the % change in alpha
float alpha_percent = float(constrain(A - gray_value)) / 255.0;