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The following functions control the TWAIN Source's brightness, contrast, and resolution settings.
Setting / Getting Brightness Level
DTWAIN_EnumBrightnessValues
DTWAIN_GetBrightness
DTWAIN_SetBrightness
Setting / Getting Contrast Level
DTWAIN_EnumContrastValues
DTWAIN_GetContrast
DTWAIN_SetContrast
Setting / Getting X-Y Resolution Values
DTWAIN_EnumResolutionValues
DTWAIN_GetResolution
DTWAIN_SetResolution
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