ForeColor Property (BarcodeReadOptions)

Gets or sets the barcode foreground (bars or symbol) color used when reading barcodes.

Syntax

C#
Visual Basic
WinRT C#
Objective-C
Java
WinRT JavaScript
C++

[DisplayNameAttribute("Fore color")]
[CategoryAttribute("				Colors")]
[DescriptionAttribute("Foreground (bar) color to use when searching for barcodes")]
public RasterColor ForeColor {get; set;}

'Declaration
 
<DisplayNameAttribute("Fore color")>
<CategoryAttribute("				Colors")>
<DescriptionAttribute("Foreground (bar) color to use when searching for barcodes")>
Public Property ForeColor As RasterColor

'Usage
 
Dim instance As BarcodeReadOptions
Dim value As RasterColor
 
instance.ForeColor = value
 
value = instance.ForeColor

[DisplayNameAttribute("Fore color")]
[CategoryAttribute("				Colors")]
[DescriptionAttribute("Foreground (bar) color to use when searching for barcodes")]
public RasterColor ForeColor {get; set;}

@property (nonatomic, copy) LTRasterColor* foreColor;

public RasterColor getForeColor()
public void setForeColor(RasterColor value)

DisplayNameAttribute("Fore color")
CategoryAttribute("				Colors")
DescriptionAttribute("Foreground (bar) color to use when searching for barcodes")
 
get_ForeColor();
set_ForeColor(value);
Object.defineProperty('ForeColor');

[DisplayNameAttribute("Fore color")]
[CategoryAttribute("				Colors")]
[DescriptionAttribute("Foreground (bar) color to use when searching for barcodes")]
public:
property RasterColor ForeColor {
   RasterColor get();
   void set (    RasterColor value);
}

Property Value

A Leadtools.RasterColor that specifies the barcode foreground (bars or symbol) color to use when searching for barcodes. The default value is "Black" (RGB of #000000).

Remarks

If the input image is bitonal (B/W), then this value will not be used. The foreground color is always considered to be black (or the foreground color in the image palette) and the background color is always considered to be white (or the background color in the image palette).

When the input image is not bitonal, LEADTOOLS will perform intensity detect operation on the image to convert it to black and white before searching for the barcodes and uses the value of ForeColor and BackColor as the high and low threshold.

Example

C#
Visual Basic
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Forms
Imports Leadtools.Barcode
Imports Leadtools.ImageProcessing

Public Sub BarcodeReadOptions_ColorsExample()
   Dim imageFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Barcode2.tif")

   ' Create a Barcode engine
   Dim engine As New BarcodeEngine()

   ' Get the Barcode reader instance
   Dim reader As BarcodeReader = engine.Reader

   Using codecs As New RasterCodecs()
      Using image As RasterImage = codecs.Load(imageFileName, 0, CodecsLoadByteOrder.BgrOrGray, 1, 1)
         ' Invert the image
         Console.WriteLine("Inverting the image")
         Dim invert As New Leadtools.ImageProcessing.Color.InvertCommand()
         invert.Run(image)

         ' All barcodes have default options of black foreground color and white background color, so
         ' reading the barcode with default options should not return any barcodes right now

         ' Read the QR barcode from this image using default options
         Console.WriteLine("Reading using default options")
         Dim barcode As BarcodeData = reader.ReadBarcode(image, LogicalRectangle.Empty, BarcodeSymbology.QR, Nothing)

         ' Show its location and data if found
         ' This will print out "Not found"
         If Not IsNothing(barcode) Then
            Console.WriteLine("Found at {0}, data:\n{1}", barcode.Bounds, barcode.Value)
         Else
            Console.WriteLine("Not found")
         End If

         ' Now create QR read options to have white foreground color and black background color
         Dim qrReadOptions As New QRBarcodeReadOptions()
         qrReadOptions.ForeColor = RasterColor.FromKnownColor(RasterKnownColor.White)
         qrReadOptions.BackColor = RasterColor.FromKnownColor(RasterKnownColor.Black)

         ' And use it to try to read the QR barcode again
         Console.WriteLine("Reading using specific options that instruct the engine to look for white on black barcodes")
         barcode = reader.ReadBarcode(image, LogicalRectangle.Empty, BarcodeSymbology.QR, qrReadOptions)

         ' Show its location and data if found
         ' This will find the barcode and print its information now
         If Not IsNothing(barcode) Then
            Console.WriteLine("Found at {0}, data:\n{1}", barcode.Bounds, barcode.Value)
         Else
            Console.WriteLine("Not found")
         End If
      End Using
   End Using
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.Forms;
using Leadtools.Barcode;
using Leadtools.ImageProcessing;

public void BarcodeReadOptions_ColorsExample()
{
   string imageFileName = Path.Combine(LEAD_VARS.ImagesDir, "Barcode2.tif");

   // Create a Barcode engine
   BarcodeEngine engine = new BarcodeEngine();

   // Get the Barcode reader instance
   BarcodeReader reader = engine.Reader;

   using(RasterCodecs codecs = new RasterCodecs())
   {
      using(RasterImage image = codecs.Load(imageFileName, 0, CodecsLoadByteOrder.BgrOrGray, 1, 1))
      {
         // Invert the image
         Console.WriteLine("Inverting the image");
         Leadtools.ImageProcessing.Color.InvertCommand invert = new Leadtools.ImageProcessing.Color.InvertCommand();
         invert.Run(image);

         // All barcodes have default options of black foreground color and white background color, so
         // reading the barcode with default options should not return any barcodes right now

         // Read the QR barcode from this image using default options
         Console.WriteLine("Reading using default options");
         BarcodeData barcode = reader.ReadBarcode(image, LogicalRectangle.Empty, BarcodeSymbology.QR, null);

         // Show its location and data if found
         // This will print out "Not found"
         if(barcode != null)
         {
            Console.WriteLine("Found at {0}, data:\n{1}", barcode.Bounds, barcode.Value);
         }
         else
         {
            Console.WriteLine("Not found");
         }

         // Now create QR read options to have white foreground color and black background color
         QRBarcodeReadOptions qrReadOptions = new QRBarcodeReadOptions();
         qrReadOptions.ForeColor = RasterColor.FromKnownColor(RasterKnownColor.White);
         qrReadOptions.BackColor = RasterColor.FromKnownColor(RasterKnownColor.Black);

         // And use it to try to read the QR barcode again
         Console.WriteLine("Reading using specific options that instruct the engine to look for white on black barcodes");
         barcode = reader.ReadBarcode(image, LogicalRectangle.Empty, BarcodeSymbology.QR, qrReadOptions);

         // Show its location and data if found
         // This will find the barcode and print its information now
         if(barcode != null)
         {
            Console.WriteLine("Found at {0}, data:\n{1}", barcode.Bounds, barcode.Value);
         }
         else
         {
            Console.WriteLine("Not found");
         }
      }
   }
}

static class LEAD_VARS
{
public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

using Leadtools;
using Leadtools.Codecs;
using Leadtools.Forms;
using Leadtools.Barcode;
using Leadtools.ImageProcessing;
using Leadtools.Examples;

public void BarcodeReadOptions_ColorsExample(RasterImage image)
{
   // Create a Barcode engine
   BarcodeEngine engine = new BarcodeEngine();
   // Get the Barcode reader instance
   BarcodeReader reader = engine.Reader;

   RasterCodecs codecs = new RasterCodecs();

   // Invert the image
   Console.WriteLine("Inverting the image");
   Leadtools.ImageProcessing.Color.InvertCommand invert = new Leadtools.ImageProcessing.Color.InvertCommand();
   invert.Run(image);

   // All barcodes have default options of black foreground color and white background color, so
   // reading the barcode with default options should not return any barcodes right now

   // Read the QR barcode from this image using default options
   Console.WriteLine("Reading using default options");
   BarcodeData barcode = reader.ReadBarcode(image, LogicalRectangle.Empty, BarcodeSymbology.QR, null);

   // Show its location and data if found
   // This will print out "Not found"
   if(barcode != null)
   {
      Console.WriteLine("Found at {0}, data:\n{1}", barcode.Bounds, barcode.Value);
   }
   else
   {
      Console.WriteLine("Not found");
   }

   // Now create QR read options to have white foreground color and black background color
   QRBarcodeReadOptions qrReadOptions = new QRBarcodeReadOptions();
   qrReadOptions.ForeColor = RasterColor.FromKnownColor(RasterKnownColor.White);
   qrReadOptions.BackColor = RasterColor.FromKnownColor(RasterKnownColor.Black);

   // And use it to try to read the QR barcode again
   Console.WriteLine("Reading using specific options that instruct the engine to look for white on black barcodes");
   barcode = reader.ReadBarcode(image, LogicalRectangle.Empty, BarcodeSymbology.QR, qrReadOptions);

   // Show its location and data if found
   // This will find the barcode and print its information now
   if(barcode != null)
   {
      Console.WriteLine("Found at {0}, data:\n{1}", barcode.Bounds, barcode.Value);
   }
   else
   {
      Console.WriteLine("Not found");
   }
}

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Forms
Imports Leadtools.Barcode
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Color

Public Sub BarcodeReadOptions_ColorsExample(ByVal image As RasterImage)
  ' Create a Barcode engine
  Dim engine As BarcodeEngine = New BarcodeEngine()
  ' Get the Barcode reader instance
  Dim reader As BarcodeReader = engine.Reader

  Dim codecs As RasterCodecs = New RasterCodecs()

  ' Invert the image
  Console.WriteLine("Inverting the image")
    Dim invert As InvertCommand = New InvertCommand()
  invert.Run(image)

  ' All barcodes have default options of black foreground color and white background color, so
  ' reading the barcode with default options should not return any barcodes right now

  ' Read the QR barcode from this image using default options
  Console.WriteLine("Reading using default options")
  Dim barcode As BarcodeData = reader.ReadBarcode(image, LogicalRectangle.Empty, BarcodeSymbology.QR, Nothing)

  ' Show its location and data if found
  ' This will print out "Not found"
  If Not barcode Is Nothing Then
    Console.WriteLine("Found at {0}, data:" & Constants.vbLf & "{1}", barcode.Bounds, barcode.Value)
  Else
    Console.WriteLine("Not found")
  End If

  ' Now create QR read options to have white foreground color and black background color
  Dim qrReadOptions As QRBarcodeReadOptions = New QRBarcodeReadOptions()
  qrReadOptions.ForeColor = RasterColor.FromKnownColor(RasterKnownColor.White)
  qrReadOptions.BackColor = RasterColor.FromKnownColor(RasterKnownColor.Black)

  ' And use it to try to read the QR barcode again
  Console.WriteLine("Reading using specific options that instruct the engine to look for white on black barcodes")
  barcode = reader.ReadBarcode(image, LogicalRectangle.Empty, BarcodeSymbology.QR, qrReadOptions)

  ' Show its location and data if found
  ' This will find the barcode and print its information now
  If Not barcode Is Nothing Then
    Console.WriteLine("Found at {0}, data:" & Constants.vbLf & "{1}", barcode.Bounds, barcode.Value)
  Else
    Console.WriteLine("Not found")
  End If
End Sub

Requirements

Target Platforms

Reference

BarcodeReadOptions Class
BarcodeReadOptions Members
BackColor Property