ShowGammaAdjustmentDlg method (ILEADRasterDlgClr)

Syntax	short ShowGammaAdjustmentDlg (long hWnd);
Overview	Refer to Using Imaging Common Dialogs

Remarks

Displays the Gamma Adjustment dialog box and gets the options for the gamma correction methods.

The layout and action of the dialog depends on the flags set in the UIFlags property. Possible options are:

Value	Meaning
GAMMAADJUSTMENT_AUTOPROCESS	[0x00000001] process the image on OK. The Common Dialog Bitmap property must be assigned a valid bitmap before calling this method.
GAMMAADJUSTMENT_SHOW_CONTEXTHELP	[0x00000002] dialog should contain a context sensitive help icon.
GAMMAADJUSTMENT_SHOW_PREVIEW	[0x00000004] show a preview of the image in the dialog. The Common Dialog Bitmap property must be assigned a valid bitmap before calling this method.
GAMMAADJUSTMENT_SHOW_TOOL_ZOOMLEVEL	[0x00000008] show the "Zoom to fit" and "Zoom Normal" toolbar buttons. The GAMMAADJUSTMENT_SHOW_PREVIEW flag must be set in order to show these buttons.
GAMMAADJUSTMENT_FORCELINKCHANNELS	[0x00000010] Force the dialog to apply "Link \all channels" at all times.

If you include GAMMAADJUSTMENT_AUTOPROCESS or GAMMAADJUSTMENT_SHOW_PREVIEW in the UIFlags property, the Common Dialog Bitmap property must be assigned a valid bitmap before calling this method.

The following properties are associated with this dialog:

GammaRedValue property

GammaGreenValue property

GammaBlueValue property

EnableGammaAllChannels Property

To include a Help button in the dialog, set the ShowHelpButton property to VARIANT_TRUE.

The Gamma Adjustment dialog can be seen below:

$image\GammaAdjustment.gif$