LeastSignificantBitFirst Property

Summary

Gets or sets a value specifying whether the image data was saved with least significant bit first or last.

Syntax

Objective-C

C++/CLI

Java

Python

public bool LeastSignificantBitFirst { get; set; }

@property (nonatomic, assign) BOOL leastSignificantBitFirst;

public boolean getLeastSignificantBitFirst() 
public void setLeastSignificantBitFirst(boolean value)

public: 
property bool LeastSignificantBitFirst { 
   bool get(); 
   void set (    bool ); 
}

LeastSignificantBitFirst # get and set (CodecsLoadInformationEventArgs)

Property Value

true if the image data was saved LSB, false if the image data was saved MSB.

Remarks

This property is used when loading raw data and some formats that support motorola byte order. To load raw 12-bit and 16-bit extended grayscale images, set the CodecsLoadInformationEventArgs.Order property to RasterByteOrder.Gray and the CodecsLoadInformationEventArgs.LeastSignificantBitFirst Property accordingly.

Example

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Svg; 
 
 
private struct RawData 
{ 
   public int Width;                               // Width of image 
   public int Height;                              // Height of image 
   public int BitsPerPixel;                        // Bits per pixel of image--if palettized, a gray palette is generated 
   public RasterViewPerspective ViewPerspective;   // View perspective of raw data (TopLeft, BottomLeft, etc) 
   public RasterByteOrder Order;                   // Rgb or Bgr 
   public int XResolution;                         // Horizontal resolution in DPI 
   public int YResolution;                         // Vertical resolution in DPI 
   public int Offset;                              // Offset into file where raw data begins 
   public bool Padding;                            // true if each line of data is padded to four bytes 
   public bool ReverseBits;                        // true if the bits of each byte are reversed  
} 
 
private RawData myRawData; 
 
private void codecs_LoadInformation(object sender, CodecsLoadInformationEventArgs e) 
{ 
   // Set the information 
   e.Format = RasterImageFormat.Raw; 
   e.Width = myRawData.Width; 
   e.Height = myRawData.Height; 
   e.BitsPerPixel = myRawData.BitsPerPixel; 
   e.XResolution = myRawData.XResolution; 
   e.YResolution = myRawData.YResolution; 
   e.Offset = myRawData.Offset; 
   e.MotorolaOrder = false; 
   e.PhotoInterpolation = CodecsPhotoInterpolation.WhiteIsZero; 
   e.PlanarConfiguration = CodecsPlanarConfiguration.PlanarFormat; // This value is used only if Format is RasterImageFormat.RawPackBits 
   e.Reverse = true; 
   e.StripSize = 10; 
   e.WhiteOnBlack = false; 
   e.GetPalette(); 
          
   Debug.WriteLine($"Stream: {e.Stream.ToString()}"); 
          
   if (myRawData.Padding) 
      e.Pad4 = true; 
 
   e.Order = myRawData.Order; 
 
   if (myRawData.ReverseBits) 
      e.LeastSignificantBitFirst = true; 
 
   e.ViewPerspective = myRawData.ViewPerspective; 
 
   // If image is palettized create a grayscale palette 
   if (e.BitsPerPixel <= 8) 
   { 
      int colors = 1 << e.BitsPerPixel; 
      RasterColor[] palette = new RasterColor[colors]; 
      for (int i = 0; i < palette.Length; i++) 
      { 
         byte val = (byte)((i * 255) / (colors - 1)); 
         palette[i] = new RasterColor(val, val, val); 
      } 
 
      e.SetColorMask(palette); 
      e.SetPalette(palette); 
   } 
} 
public void LoadInformationExample() 
{ 
   // First, load a JPEG or CMP file 
   string srcFilename = Path.Combine(LEAD_VARS.ImagesDir, "IMAGE2.CMP"); 
   string rawFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.raw"); 
   RasterCodecs codecs = new RasterCodecs(); 
   RasterImage image = codecs.Load(srcFilename); 
         
   // Save this image as RAW data 
 
   // Set RAW options 
   codecs.Options.Raw.Save.Pad4 = true; 
   codecs.Options.Raw.Save.ReverseBits = true; 
   codecs.Options.Save.OptimizedPalette = true; 
 
   codecs.Save(image, rawFileName, RasterImageFormat.Raw, 0); 
 
   // Save information about this image so we can use it to load the RAW file 
   myRawData = new RawData(); 
   myRawData.Width = image.Width; 
   myRawData.Height = image.Height; 
   myRawData.BitsPerPixel = image.BitsPerPixel; 
   myRawData.ViewPerspective = image.ViewPerspective; 
   myRawData.Order = image.Order; 
   myRawData.XResolution = image.XResolution; 
   myRawData.YResolution = image.YResolution; 
   myRawData.Offset = 0; 
   myRawData.Padding = true; 
   myRawData.ReverseBits = true; 
 
   // We dont need the image anymore 
   image.Dispose(); 
 
   // Now load this RAW image back 
 
   // First subscribe to the LoadInformation event so we can set the image information 
   codecs.LoadInformation += new EventHandler<CodecsLoadInformationEventArgs>(codecs_LoadInformation); 
 
   // Load the image 
   image = codecs.Load(rawFileName); 
 
   // Unsubscribe from the event 
   codecs.LoadInformation -= new EventHandler<CodecsLoadInformationEventArgs>(codecs_LoadInformation); 
 
   // save it as bmp for testing 
   codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "Image1_raw.bmp"), RasterImageFormat.Bmp, 0); 
 
   // Clean up 
   image.Dispose(); 
   codecs.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}

Requirements

Target Platforms

Reference

CodecsLoadInformationEventArgs Class

CodecsLoadInformationEventArgs Members

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Help Version 22.0.2023.5.5

Leadtools.Codecs Assembly

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