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Fix blur radius when using the Fourier method

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Fix the formula, adapt old pp3s, and change the maximum blur radius
where applicable.
This commit is contained in:
Lawrence Lee
2024-10-27 18:45:58 -07:00
parent ca329d9013
commit 9b16f407aa
7 changed files with 58 additions and 23 deletions
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15
rtengine/iplocalcontrast.cc
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@@ -52,21 +52,8 @@ void ImProcFunctions::localContrast(LabImage *lab, float **destination, const rt
#endif
gaussianBlur(lab->L, buf, width, height, sigma);
} else {
float kr = 1.f;
//emprical adjustment between FFTW radius and Gaussainblur
//under 50 ==> 10.f
//above 400 ==> 1.f
if(settings->fftwsigma == false) {//empirical formula
float ak = -9.f / 350.f;
float bk = 10.f - 50.f * ak;
kr = ak * sigma + bk;
if(sigma < 50.f) kr = 10.f;
if(sigma > 400.f) kr = 1.f;
} else {//sigma *= sigma
kr = sigma;
}
//OPENMP disabled
ImProcFunctions::fftw_convol_blur2(lab->L, buf, width, height, kr * sigma, 0, 0);
ImProcFunctions::fftw_convol_blur2(lab->L, buf, width, height, sigma, 0, 0);
}
#ifdef _OPENMP
#pragma omp parallel for if(multiThread)