InvertContrast(ImGearRasterPage) Method

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

'Declaration
 
Public Overloads Shared Sub InvertContrast( _
   ByVal page As ImGearRasterPage _
)

'Usage
 
Dim page As ImGearRasterPage
 
ImGearRasterProcessing.InvertContrast(page)

public static void InvertContrast( 
   ImGearRasterPage page
)

public: static void InvertContrast( 
   ImGearRasterPage* page
)

public:
static void InvertContrast( 
   ImGearRasterPage^ page
)

Parameters

page: Image to invert contrast.

If the image is indexed and the palette is not grayscale, this method modifies image's palette, otherwise it modifies image's pixels. The method processes only color channels.

Use ImGearRasterProcessingVerifier.CanApplyInvertContrast method to check whether the operation can be performed.

C#
Visual Basic

// Detect an area around a point in an image based upon a base pixel and threshold.

// Top left corner of image
ImGearPoint igPoint = new ImGearPoint(0, 0);
//Get the Pixel currently there.
ImGearPixel igPixel = igRasterPage.DIB.GetPixelCopy(0, 0);
// Detection class, threshold is difference in pixel channel values from specified pixel.
ImGearPixelCheckerThreshold igPixelCheckerThreshold = new ImGearPixelCheckerThreshold(igPixel, 100);
// Detect the region around target point within the threshold.
ImGearEffects.DetectArea(igRasterPage, igPoint, igPixelCheckerThreshold);

// Invert the contrast of the selected region to visible show the detected region.
ImGearRasterProcessing.InvertContrast(igRasterPage);

' Detect an area around a point in an image based upon a base pixel and threshold.

' Top left corner of image
Dim igPoint As New ImGearPoint(0, 0)
'Get the Pixel currently there.
Dim igPixel As ImGearPixel = igRasterPage.DIB.GetPixelCopy(0, 0)
' Detection class, threshold is difference in pixel channel values from specified pixel.
Dim igPixelCheckerThreshold As New ImGearPixelCheckerThreshold(igPixel, 100)
' Detect the region around target point within the threshold.
ImGearEffects.DetectArea(igRasterPage, igPoint, igPixelCheckerThreshold)

' Invert the contrast of the selected region to visible show the detected region.
ImGearRasterProcessing.InvertContrast(igRasterPage)

Reference

ImGearRasterProcessing Class
ImGearRasterProcessing Members
Overload List
ImGearRasterPage Class