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CreateMaskFromRegion Method

Summary

Creates a 1-bit mask image from the region that is defined in the image.

Syntax

Java

Objective-C

WinRT C#

C++

public RasterImage CreateMaskFromRegion()

Public Function CreateMaskFromRegion() As Leadtools.RasterImage

public Leadtools.RasterImage CreateMaskFromRegion()

- (nullable LTRasterImage *)createMaskFromRegion:(NSError **)error

public RasterImage createMaskFromRegion()

 function Leadtools.RasterImage.CreateMaskFromRegion()

public: 
Leadtools.RasterImage^ CreateMaskFromRegion();

Return Value

The newly created RasterImage which will be updated with a 1-bit, black-and-white image, where pixels from the region are white, and all others are black.

Remarks

For more information, refer to Implementing Transparency.

For more information, refer to Creating a Region.

For more information, refer to Saving A Region.

For more information, refer to Working with the Existing Region.

Example

This example will load an image, sets a color region using black, and then creates a 1-bit mask image from that image and saves it to disk.

Silverlight C#

Silverlight VB

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Core; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Dicom; 
using Leadtools.Drawing; 
using Leadtools.Controls; 
using LeadtoolsExamples.Common; 
using Leadtools.Svg; 
 
public void CreateMaskFromRegionExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   string srcFileName = Path.Combine(ImagesPath.Path, "Image1.cmp"); 
   string destFileName = Path.Combine(ImagesPath.Path, "Image1_CreateMaskFromRegion.bmp"); 
 
   // Load the image 
   RasterImage image = codecs.Load(srcFileName); 
 
   // Posterize the image to decrease the number of colors 
   PosterizeCommand posterize = new PosterizeCommand(16); 
   posterize.Run(image); 
 
   // Specify a pixel in the upper left of the displayed image 
   LeadPoint pt = new LeadPoint(image.ImageWidth / 8, image.ImageHeight / 8); 
 
   // Adjust the point in case the view perspective is not TopLeft 
   pt = image.PointToImage(RasterViewPerspective.TopLeft, pt); 
 
   // Get the color of the specified pixel 
   RasterColor regionColor = image.GetPixelColor(pt.Y, pt.X); 
 
   // Create a region that includes all pixels of that color 
   image.AddColorToRegion(regionColor, RasterRegionCombineMode.Set); 
 
   RasterImage maskImage = image.CreateMaskFromRegion(); 
 
   codecs.Save(maskImage, destFileName, RasterImageFormat.Bmp, 1); 
 
   maskImage.Dispose(); 
   image.Dispose(); 
   codecs.Dispose(); 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Core 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Controls 
Imports Leadtools.Dicom 
Imports Leadtools.Drawing 
Imports Leadtools.Svg 
 
Public Sub CreateMaskFromRegionExample() 
   Dim codecs As RasterCodecs = New RasterCodecs() 
 
   Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp") 
   Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1_CreateMaskFromRegion.bmp") 
 
   ' Load the image 
   Dim image As RasterImage = codecs.Load(srcFileName) 
 
   ' Posterize the image to decrease the number of colors 
   Dim posterize As PosterizeCommand = New PosterizeCommand(16) 
   posterize.Run(image) 
 
   ' Specify a pixel in the upper left of the displayed image 
   Dim pt As LeadPoint = New LeadPoint(image.ImageWidth \ 8, image.ImageHeight \ 8) 
 
   ' Adjust the point in case the view perspective is not TopLeft 
   pt = image.PointToImage(RasterViewPerspective.TopLeft, pt) 
 
   ' Get the color of the specified pixel 
   Dim regionColor As RasterColor = image.GetPixelColor(pt.Y, pt.X) 
 
   ' Create a region that includes all pixels of that color 
   image.AddColorToRegion(regionColor, RasterRegionCombineMode.Set) 
 
   Dim maskImage As RasterImage = image.CreateMaskFromRegion() 
 
   codecs.Save(maskImage, destFileName, RasterImageFormat.Bmp, 1) 
 
   maskImage.Dispose() 
   image.Dispose() 
   codecs.Dispose() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Dicom; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Core; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Examples; 
using Leadtools.Windows.Media; 
 
public void CreateMaskFromRegionExample(RasterImage image, Stream destStream) 
{ 
   // Posterize the image to decrease the number of colors 
   PosterizeCommand posterize = new PosterizeCommand(16); 
   posterize.Run(image); 
 
   // Specify a pixel in the upper left of the displayed image 
   LeadPoint pt = new LeadPoint(image.ImageWidth / 8, image.ImageHeight / 8); 
 
   // Adjust the point in case the view perspective is not TopLeft 
   pt = image.PointToImage(RasterViewPerspective.TopLeft, pt); 
 
   // Get the color of the specified pixel 
   RasterColor regionColor = image.GetPixelColor(pt.Y, pt.X); 
 
   // Create a region that includes all pixels of that color 
   image.AddColorToRegion(regionColor, RasterRegionCombineMode.Set); 
 
   RasterImage maskImage = image.CreateMaskFromRegion(); 
 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.Save(maskImage, destStream, RasterImageFormat.Png, 0); 
 
   maskImage.Dispose(); 
   image.Dispose(); 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.Dicom 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Core 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Windows.Media 
 
Public Sub CreateMaskFromRegionExample(ByVal image As RasterImage, ByVal destStream As Stream) 
   ' Posterize the image to decrease the number of colors 
   Dim posterize As PosterizeCommand = New PosterizeCommand(16) 
   posterize.Run(image) 
 
   ' Specify a pixel in the upper left of the displayed image 
   Dim pt As LeadPoint = New LeadPoint(image.ImageWidth / 8, image.ImageHeight / 8) 
 
   ' Adjust the point in case the view perspective is not TopLeft 
   pt = image.PointToImage(RasterViewPerspective.TopLeft, pt) 
 
   ' Get the color of the specified pixel 
   Dim regionColor As RasterColor = image.GetPixelColor(pt.Y, pt.X) 
 
   ' Create a region that includes all pixels of that color 
   image.AddColorToRegion(regionColor, RasterRegionCombineMode.Set) 
 
   Dim maskImage As RasterImage = image.CreateMaskFromRegion() 
 
   Dim codecs As RasterCodecs = New RasterCodecs() 
   codecs.Save(maskImage, destStream, RasterImageFormat.Png, 0) 
 
   maskImage.Dispose() 
   image.Dispose() 
End Sub

Requirements

Target Platforms

Reference

RasterImage Class

RasterImage Members

Help Version 19.0.2017.10.27

Leadtools Assembly

Introduction

Getting Started

Namespaces

Leadtools Namespace

Leadtools.ImageProcessing Namespace

Assemblies