Netscape Method

Summary

Creates an array of RasterColor objects that represent the Netscape Fixed palette.

Syntax

C++

public static RasterColor[] Netscape()

Public Shared Function Netscape() As RasterColor()

public: 
static array<RasterColor>^ Netscape();

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Core; 
 
 
public void NetscapePaletteExample() 
{ 
	string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
	string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_Netscape.bmp"); 
 
	RasterCodecs codecs = new RasterCodecs(); 
	codecs.ThrowExceptionsOnInvalidImages = true; 
 
	// Load the source image as 8 bits/pixel 
	RasterImage srcImage = codecs.Load(srcFileName, 8, CodecsLoadByteOrder.Rgb, 1, 1); 
 
	// Get the netscape palette 
	RasterColor[] netscapePalette = RasterPalette.Netscape(); 
 
	// Create the new palletized image. 
	RasterImage destImage = new RasterImage( 
	   RasterMemoryFlags.Conventional, 
	   srcImage.Width, 
	   srcImage.Height, 
	   8, 
	   srcImage.Order, 
	   srcImage.ViewPerspective, 
	   netscapePalette, 
	   IntPtr.Zero, 
	   0); 
 
	// Set the dithering method. 
	srcImage.DitheringMethod = RasterDitheringMethod.StevensonArce; 
 
	srcImage.Access(); 
	destImage.Access(); 
 
	// Initialize the dithering process. 
	srcImage.StartDithering(netscapePalette, 256); 
 
	// Allocate the output buffer for 8-bit data. 
	byte[] inBuffer = new byte[srcImage.Width * 3];  // Buffer to hold the input row. 
	byte[] outBuffer = new byte[srcImage.Width];      // Buffer to hold the output row. 
 
	// Use DitherLine method to process each row in the image. 
	for (int i = 0; i < srcImage.Height; i++) 
	{ 
		srcImage.GetRow(i, inBuffer, 0, srcImage.BytesPerLine); 
		srcImage.DitherLine(inBuffer, 0, outBuffer, 0); 
		destImage.SetRow(i, outBuffer, 0, destImage.BytesPerLine); 
	} 
 
	// End the dithering process. 
	srcImage.StopDithering(); 
 
	destImage.Release(); 
	srcImage.Release(); 
 
	// Save the destination image 
	codecs.Save(destImage, destFileName, RasterImageFormat.Bmp, 8); 
 
	// Cleanup 
	srcImage.Dispose(); 
	destImage.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS21\Resources\Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Core 
 
Public Sub NetscapePaletteExample() 
   Dim codecs As RasterCodecs = New RasterCodecs() 
 
   codecs.ThrowExceptionsOnInvalidImages = True 
 
   Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp") 
   Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1_Netscape.bmp") 
 
   ' Load the source image as 8 bits/pixel 
   Dim srcImage As RasterImage = codecs.Load(srcFileName, 8, CodecsLoadByteOrder.Rgb, 1, 1) 
 
   ' Get the netscape palette 
   Dim netscapePalette As RasterColor() = RasterPalette.Netscape() 
 
   ' Create the new palletized image. 
   Dim destImage As RasterImage = New RasterImage(RasterMemoryFlags.Conventional, srcImage.Width, srcImage.Height, 8, srcImage.Order, srcImage.ViewPerspective, netscapePalette, IntPtr.Zero, 0) 
 
   ' Set the dithering method. 
   srcImage.DitheringMethod = RasterDitheringMethod.StevensonArce 
 
   srcImage.Access() 
   destImage.Access() 
 
   ' Initialize the dithering process. 
   srcImage.StartDithering(netscapePalette, 256) 
 
   ' Allocate the output buffer for 8-bit data. 
   Dim inBuffer As Byte() = New Byte(srcImage.Width * 3 - 1) {} ' Buffer to hold the input row. 
   Dim outBuffer As Byte() = New Byte(srcImage.Width - 1) {} ' Buffer to hold the output row. 
 
   ' Use DitherLine method to process each row in the image. 
   Dim i As Integer = 0 
   Do While i < srcImage.Height 
      srcImage.GetRow(i, inBuffer, 0, srcImage.BytesPerLine) 
      srcImage.DitherLine(inBuffer, 0, outBuffer, 0) 
      destImage.SetRow(i, outBuffer, 0, destImage.BytesPerLine) 
      i += 1 
   Loop 
 
   ' End the dithering process. 
   srcImage.StopDithering() 
 
   destImage.Release() 
   srcImage.Release() 
 
   ' Save the destination image 
   codecs.Save(destImage, destFileName, RasterImageFormat.Bmp, 8) 
 
   ' Cleanup 
   srcImage.Dispose() 
   destImage.Dispose() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\LEADTOOLS21\Resources\Images" 
End Class

Requirements

Target Platforms

Reference

RasterPalette Class

RasterPalette Members

Download our FREE evaluation

Help Version 21.0.2021.7.2

Leadtools Assembly

Introduction

Getting Started

Namespaces

Leadtools Namespace

Leadtools.ImageProcessing Namespace

Assemblies