RasterPalette Class

Summary

Encapsulates and provides support for managing image palettes.

Syntax

Objective-C

C++/CLI

Java

Python

public static class RasterPalette

@interface LTRasterPalette : NSObject

public final class RasterPalette

public ref class RasterPalette abstract sealed

class RasterPalette:

Remarks

The palette is an array that contains the colors for displaying the image.

For more details, refer to Introduction: Palette Handling.

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 StartDitheringExample() 
{ 
	RasterCodecs codecs = new RasterCodecs(); 
	// Load an image that has BottomLeft ViewPerspective 
	RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1.CMP")); 
 
	RasterColor[] Palette = RasterPalette.Fixed(256); 
 
	// Create the new palletized image. 
	RasterImage destinationImage = new RasterImage(RasterMemoryFlags.Conventional, image.Width, image.Height, 8, image.Order, image.ViewPerspective, Palette, IntPtr.Zero, 0); 
 
	// Set the dithering method. 
	image.DitheringMethod = RasterDitheringMethod.StevensonArce; 
 
	// Initialize the dithering process. 
	image.StartDithering(Palette, 256); 
 
	// Allocate the output buffer for 8-bit data. 
	byte[] InBuffer = new byte[image.Width * 3];// Buffer to hold the input row. 
	byte[] OutBuffer = new byte[image.Width];// Buffer to hold the output row. 
 
	// Use DitherLine method to process each row in the image. 
	image.Access(); 
	destinationImage.Access(); 
	for (int i = 0; i < image.Height; i++) 
	{ 
		image.GetRow(i, InBuffer, 0, image.BytesPerLine); 
		image.DitherLine(InBuffer, 0, OutBuffer, 0); 
		destinationImage.SetRow(i, OutBuffer, 0, destinationImage.BytesPerLine); 
	} 
	destinationImage.Release(); 
	image.Release(); 
 
	// End the dithering process. 
	image.StopDithering(); 
 
	codecs.Save(destinationImage, Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1_DitherLine.BMP"), RasterImageFormat.Bmp, 0); 
 
	image.Dispose(); 
	destinationImage.Dispose(); 
	codecs.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}

Requirements

Target Platforms

Reference

RasterPalette Members

Leadtools Namespace

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Help Version 22.0.2023.5.16

Leadtools Assembly

Introduction

Getting Started

Namespaces

Leadtools Namespace

Leadtools.ImageProcessing Namespace

Assemblies