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Better stretch non full range images like CR2

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This commit is contained in:
Dušan Poizl
2023-11-15 10:12:55 +01:00
parent 8e3c1b35db
commit 35d5934227
1 changed files with 7 additions and 4 deletions
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stretchtoolbar.cpp
+7 -4
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@@ -114,18 +114,21 @@ void StretchToolbar::stretchImage(Image *img)
float max2 = 0;
for(; i < ch; i++)
{
double median, mad;
double median, mad, max;
median = stats.m_median[i];
mad = stats.m_mad[i];
max = stats.m_max[i];
median /= img->rawImage()->norm();
mad /= img->rawImage()->norm();
max /= img->rawImage()->norm();
float bp = median + mad * BLACK_POINT_SIGMA * MAD_TO_SIGMA;
float mid = MTF(median - bp, TARGET_BACKGROUND);
m_mtfParam.blackPoint[i-o] = bp;
m_mtfParam.midPoint[i-o] = mid;
m_mtfParam.whitePoint[i-o] = 1.0f;
m_mtfParam.midPoint[i-o] = mid / max;
m_mtfParam.whitePoint[i-o] = max;
bp2 += bp;
mid2 += mid;
max2 = max > max2 ? max : max2;
}
if(ch == 1)
{
@@ -137,7 +140,7 @@ void StretchToolbar::stretchImage(Image *img)
{
m_mtfParam.blackPoint[0] = m_mtfParam.blackPoint[1] = m_mtfParam.blackPoint[2] = bp2 / ch;
m_mtfParam.midPoint[0] = m_mtfParam.midPoint[1] = m_mtfParam.midPoint[2] = mid2 / ch;
m_mtfParam.whitePoint[0] = m_mtfParam.whitePoint[1] = m_mtfParam.whitePoint[2] = 1.0f;
m_mtfParam.whitePoint[0] = m_mtfParam.whitePoint[1] = m_mtfParam.whitePoint[2] = max2;
m_stfSlider->setMTFParams(m_mtfParam.blackPoint[0], m_mtfParam.midPoint[0], m_mtfParam.whitePoint[0]);
}
else