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Fix tone equalizer darkening of extreme luminances

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Extend the extreme bands' contributions all the way to -infinity and
+infinity EVs.
This commit is contained in:
Lawrence Lee
2022-06-30 21:19:30 -07:00
parent efc350228e
commit 38d85581df
1 changed files with 13 additions and 9 deletions
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22
rtengine/iptoneequalizer.cc
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@@ -15,13 +15,13 @@ const std::vector<std::array<float, 3>> colormap = {
{0.5f, 0.f, 0.5f},
{0.5f, 0.f, 0.5f},
{0.5f, 0.f, 0.5f},
{0.5f, 0.f, 0.5f},
{0.5f, 0.f, 0.5f}, // blacks
{0.f, 0.f, 1.f}, // shadows
{0.5f, 0.5f, 0.5f}, // midtones
{1.f, 1.f, 0.f}, // highlights
{1.f, 0.f, 0.f}, // whites
{1.f, 0.f, 0.f},
{1.f, 0.f, 0.f},
{1.f, 0.f, 0.f}
};
@@ -73,8 +73,8 @@ void toneEqualizer(
// Build the luma channels: band-pass filters with gaussian windows of
// std 2 EV, spaced by 2 EV
const float centers[12] = {
-18.0f, -16.0f, -14.0f, -12.0f, -10.0f, -8.0f, -6.0f,
-4.0f, -2.0f, 0.0f, 2.0f, 4.0f
-16.0f, -14.0f, -12.0f, -10.0f, -8.0f, -6.0f,
-4.0f, -2.0f, 0.0f, 2.0f, 4.0f, 6.0f
};
const auto conv = [&](int v, float lo, float hi) -> float {
@@ -82,7 +82,6 @@ void toneEqualizer(
return exp2(float(v) / 100.f * f);
};
const float factors[12] = {
conv(params.bands[0], 2.f, 3.f), // -18 EV
conv(params.bands[0], 2.f, 3.f), // -16 EV
conv(params.bands[0], 2.f, 3.f), // -14 EV
conv(params.bands[0], 2.f, 3.f), // -12 EV
@@ -93,7 +92,8 @@ void toneEqualizer(
conv(params.bands[3], 3.f, 2.f), // -2 EV
conv(params.bands[4], 3.f, 2.f), // 0 EV
conv(params.bands[4], 3.f, 2.f), // 2 EV
conv(params.bands[4], 3.f, 2.f) // 4 EV
conv(params.bands[4], 3.f, 2.f), // 4 EV
conv(params.bands[4], 3.f, 2.f) // 6 EV
};
rtengine::TMatrix ws = rtengine::ICCStore::getInstance()->workingSpaceMatrix(workingProfile);
@@ -149,10 +149,13 @@ void toneEqualizer(
w_sum += gauss(centers[i], 0.f);
}
constexpr float luma_lo = -14.f;
constexpr float luma_hi = 4.f;
const auto process_pixel =
[&](float y) -> float {
// convert to log space
const float luma = rtengine::max(log2(rtengine::max(y, 0.f)), -18.0f);
const float luma = rtengine::LIM(log2(rtengine::max(y, 0.f)), luma_lo, luma_hi);
// build the correction as the sum of the contribution of each
// luminance channel to current pixel
@@ -191,7 +194,7 @@ void toneEqualizer(
std::array<float, 3> ret = { 0.f, 0.f, 0.f };
// convert to log space
const float luma = rtengine::max(log2(rtengine::max(y, 0.f)), -18.0f);
const float luma = rtengine::LIM(log2(rtengine::max(y, 0.f)), luma_lo, luma_hi);
// build the correction as the sum of the contribution of each
// luminance channel to current pixel
@@ -227,12 +230,13 @@ void toneEqualizer(
vfloat zerov = F2V(0.f);
vfloat vw_sum = F2V(w_sum);
const vfloat noisev = F2V(-18.f);
const vfloat vluma_lo = F2V(luma_lo);
const vfloat vluma_hi = F2V(luma_hi);
const vfloat xlog2v = F2V(xlogf(2.f));
const auto vprocess_pixel =
[&](vfloat y) -> vfloat {
const vfloat luma = vmaxf(xlogf(vmaxf(y, zerov)) / xlog2v, noisev);
const vfloat luma = vminf(vmaxf(xlogf(vmaxf(y, zerov)) / xlog2v, vluma_lo), vluma_hi);
vfloat correction = zerov;