AddBorderToRegion Method

Summary

Creates a region of pixels with values that fall within a range defined by the value of a specific pixel and a lower and upper tolerance value but are not equal to the borderColor.

Syntax

Objective-C

C++/CLI

Java

Python

public void AddBorderToRegion( 
   int left, 
   int top, 
   RasterColor borderColor, 
   RasterColor lowerToleranceColor, 
   RasterColor upperToleranceColor, 
   RasterRegionCombineMode combineMode 
)

- (BOOL)addBorderToRegion:(NSInteger)left  
                      top:(NSInteger)top  
              borderColor:(LTRasterColor *)borderColor  
      lowerToleranceColor:(LTRasterColor *)lowTolColor  
      upperToleranceColor:(LTRasterColor *)upTolColor  
              combineMode:(LTRasterRegionCombineMode)combineMode  
                    error:(NSError **)error

public void addBorderToRegion( 
  int left,  
  int top,  
  RasterColor borderColor,  
  RasterColor lowerToleranceColor,  
  RasterColor upperToleranceColor,  
  RasterRegionCombineMode combineMode 
)

public: 
void AddBorderToRegion(  
   int left, 
   int top, 
   RasterColor borderColor, 
   RasterColor lowerToleranceColor, 
   RasterColor upperToleranceColor, 
   RasterRegionCombineMode combineMode 
)

def AddBorderToRegion(self,left,top,borderColor,lowerToleranceColor,upperToleranceColor,combineMode):

Parameters

left
X coordinate of a point. The color of the specified point will be used to set the region.

top
Y coordinate of a point. The color of the specified point will be used to set the region.

borderColor
Border color.

lowerToleranceColor
Lower tolerance values that set the lower stopping point for the region.

upperToleranceColor
Upper tolerance values that set the lower stopping point for the region.

combineMode
The action to take regarding the existing image region, if one is defined.

Remarks

For color bitmaps:

If the value of the pixel at (x, y) is (125, 125, 125) and lowerToleranceColor is (20,30,15), then the lower stopping point is (105, 95, 110). If upperToleranceColor is (20,30,15), then the upper stopping point is (145,155,140). In this case, the pixels with values between (105,95,110) and (145,155,140) are non-border pixels and will be included in the region. Any pixel with a value outside this range or equal to borderColor is considered a border pixel.

For gray scale bitmaps:

The minimum channel tolerance value of lowerToleranceColor will be used to set the lower stopping point, and the minimum channel tolerance value of upperToleranceColor will be used to set the upper stopping point. For example, if the value of the pixel at (x, y) is (125, 125, 125) and lowerToleranceColor is (20,30,15), the smallest value of the triplet (15) will be used to create the lower stopping point of (110,110,110). If upperToleranceColor is (10,25,20), the smallest value of that triplet (10) will be used to create the upper stopping point of (135,135,135). In this case, the pixels with values between (110, 110, 110) and (135,135,135) are non-border pixels and will be included in the region. Any pixel with a value outside this range or equal to borderColor is considered a border pixel.

This method supports signed/unsiged data images.

To update an existing region, specify how the new region is to be combined with the existing one using the combineMode parameter. For more information, refer to RasterRegionCombineMode.

The AddBorderToRegion function can use the Extended Grayscale mask. For more information, refer to Grayscale Images.

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

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 Leadtools.Svg; 
 
 
public void AddBorderToRegionExample() 
{ 
	RasterCodecs codecs = new RasterCodecs(); 
 
	string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
	string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_AddBorderToRegion.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); 
 
	// Create a border region at this point 
	RasterColor borderColor = image.GetPixelColor(pt.Y, pt.X); 
	RasterColor lowerColor = new RasterColor(20, 30, 150); 
	RasterColor upperColor = new RasterColor(15, 30, 10); 
	image.AddBorderToRegion(pt.X, pt.Y, borderColor, lowerColor, upperColor, RasterRegionCombineMode.Set); 
 
	// Fill the region with blue 
	FillCommand fill = new FillCommand(RasterColor.FromKnownColor(RasterKnownColor.Blue)); 
	fill.Run(image); 
 
	// Save the image 
	codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24); 
 
	image.Dispose(); 
	codecs.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}

Requirements

Target Platforms

Reference

RasterImage Class

RasterImage Members

Download our FREE evaluation

Help Version 22.0.2023.5.16