Contrast property (ILTImageEffects)

Syntax	float Contrast
Overview	Refer to Getting and Setting Capabilities.

Remarks

Gets or sets the contrast value to apply to the image being scanned.

This property is equivalent to the ICAP_CONTRAST capability. There are two ways of determining the possible values for this capability:

$image\sqrblit.gif$ call the QueryCapability method with pCapability. Capability set to ICAP_CONTRAST.

$image\sqrblit.gif$ call the GetCapability method (MFC) or the GetCapability2 method (VB) with pCapability. Capability set to ICAP_CONTRAST and the IFlags parameter set to L_LTWAIN_CAPABILITY_GETVALUES.

For more information on specific TWAIN capabilities, refer to the TWAIN 1.9 specification.

This property is updated with the driver’s current setting when the GetProperties method is called.

To update the image effect options, set this property and the other ILTImageEffects properties accessed by the ImageEffects property and call the SetProperties method.

See Also

Elements	ImageEffects property, PixelFlavor property, ColorScheme property, HighLight property, Shadow property, Brightness property, HalfTone property, GetProperties method, SetProperties method, GetCapability method, GetCapability2 method, QueryCapability method
Topics	TWAIN Functionality: Driver Settings