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Enhance contrast for very low contrast images. #1162

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Enhance contrast for very low contrast images. #1162

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9 changes: 9 additions & 0 deletions guider.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -441,6 +441,15 @@ bool Guider::PaintHelper(wxAutoBufferedPaintDCBase& dc, wxMemoryDC& memDC)
{
int blevel = m_pCurrentImage->FiltMin;
int wlevel = m_pCurrentImage->FiltMax;

// Enhance contrast for very low contrast images. This adjustment prevents the frames
// from being displayed as all-white, which is a visually unpleasant artifact commonly
// encountered in dark frames. By slightly increasing the maximum value
// when the difference between min and max values is minimal, we improve the visibility
// of image details while avoiding the all-white display issue.
if ((m_pCurrentImage->BitsPerPixel > 8) && (wlevel < 4096 && (wlevel - blevel) < 16))
wlevel += 16;

m_pCurrentImage->CopyToImage(&m_displayedImage, blevel, wlevel, pFrame->Stretch_gamma);
}

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