AdjustContrast(ImGearRasterPage,Double,Double,Double) Method

Visual Basic
C#
Managed Extensions for C++
C++/CLI

'Declaration
 
Public Overloads Shared Sub AdjustContrast( _
   ByVal page As ImGearRasterPage, _
   ByVal contrast As Double, _
   ByVal brightness As Double, _
   ByVal gamma As Double _
)

'Usage
 
Dim page As ImGearRasterPage
Dim contrast As Double
Dim brightness As Double
Dim gamma As Double
 
ImGearRasterProcessing.AdjustContrast(page, contrast, brightness, gamma)

public static void AdjustContrast( 
   ImGearRasterPage page,
   double contrast,
   double brightness,
   double gamma
)

public: static void AdjustContrast( 
   ImGearRasterPage* page,
   double contrast,
   double brightness,
   double gamma
)

public:
static void AdjustContrast( 
   ImGearRasterPage^ page,
   double contrast,
   double brightness,
   double gamma
)

Parameters

page: Image to adjust contrast.
contrast: Contrast value.
brightness: Brightness value.
gamma: Gamma value.

If the image is indexed and not grayscale, it modifies the image's palette, otherwise it modifies the image's pixels. Processes only color channels. Contrast mode is ImGearContrastModes.AUTO.

Average parameter range:

Contrast: -2 ... +2 (negative means contrast inversion. In case of 1 no changes)
Brightness: -128...+128
Gamma: 0...10

Can be applied only to the raster pages with standard (non Run-Ends) DIB.

Method ImGearRasterProcessing.Verifier.CanApplyAdjustContrast (ImGearPage page) can be called to check whether the operation can be performed.

Reference

ImGearRasterProcessing Class
ImGearRasterProcessing Members
Overload List
ImGearRasterPage Class