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Independent Gamma Correction for dual monitors as single display

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How can I use the GetDeviceGammaRamp/ SetDeviceGammaRamp APIs to adjust the gamma for a dual monitor system with the display set to one screen stretched over two monitors? (Each monitor has its own slightly different gamma adjustments). The issue I am unsure of is how i get a device context for each monitor even though they are being treated as one screen. Is this possible? Stephen

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