Syntax
Visual Basic
C#
Managed Extensions for C++
C++/CLI
Parameters
- page
- Image to invert contrast.
Remarks
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.
Example
| C# |  Copy Code |
|---|---|
// 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); | |
| Visual Basic | Copy Code |
|---|---|
' 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) | |
