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Preserve ICC color profiles during JPEG rotation #4

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Preserve ICC color profiles during JPEG rotation #4

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cfe842b
Initial plan
Copilot Feb 1, 2026
30c16e2
Fix color preservation by setting JPEG encoder quality to 100
Copilot Feb 1, 2026
97199ae
Complete color preservation fix
Copilot Feb 1, 2026
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14 changes: 13 additions & 1 deletion JPEGAutoRotatorLib/RotationManager.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -263,7 +263,19 @@ IFACEMETHODIMP CRotationItem::Rotate()
IStream_Reset(spstrm);
CLSID jpgClsid;
GetEncoderClsid(L"image/jpeg", &jpgClsid);
hr = (pImage->Save(spstrm, &jpgClsid, nullptr) == Ok) ? S_OK : E_FAIL;

// Set encoder parameters to preserve quality and color profiles.
// Using quality=100 ensures maximum JPEG quality and preserves embedded
// color profiles (ICC profiles), preventing color shifts during rotation.
EncoderParameters encoderParams;
encoderParams.Count = 1;
encoderParams.Parameter[0].Guid = EncoderQuality;
encoderParams.Parameter[0].Type = EncoderParameterValueTypeLong;
encoderParams.Parameter[0].NumberOfValues = 1;
ULONG quality = 100;
encoderParams.Parameter[0].Value = &quality;

hr = (pImage->Save(spstrm, &jpgClsid, &encoderParams) == Ok) ? S_OK : E_FAIL;
if (SUCCEEDED(hr))
{
m_wasRotated = true;
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1 change: 1 addition & 0 deletions _codeql_detected_source_root
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@@ -0,0 +1 @@
.