ReadLoadResolutions(string) Method

Summary

Examines a file to determine which resolutions it contains.

Syntax

Objective-C

C++

public LeadSize[] ReadLoadResolutions( 
   string fileName 
)

Public Overloads Function ReadLoadResolutions( _ 
   ByVal fileName As String _ 
) As LeadSize()

- (nullable NSArray<NSValue/*CGSize*/ *> *)loadResolutionsForFile:(NSString *)file error:(NSError **)error

public: 
array<LeadSize>^ ReadLoadResolutions(  
   String^ fileName 
)

Parameters

fileName
A String containing the name of the file to query.

Return Value

A LeadSize structure containing the available resolutions.

Remarks

A FlashPix, PhotoCD, JPEG 2000 or JBIG/JBIG2 file can contain more than one copy of the same image, each at a different physical resolution (width and height in pixels).

After you get the available resolutions, you can use any of the following to specify the one to be loaded:

For more information, refer to Implementing JBIG Features.

Example

This example shows how many physical resolutions are available, selects the smallest one, then loads the file.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Svg; 
using LeadtoolsExamples.Common; 
 
void ReadLoadResolutionsExample(string jbigFileName) 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   // Get the number of resolutions (sizes) available in this file 
   LeadSize[] resolution = codecs.ReadLoadResolutions(jbigFileName); 
   if (resolution.Length > 0) 
   { 
      Console.WriteLine("{0} resolutions available", resolution.Length); 
      for (int i = 0; i < resolution.Length; i++) 
         Console.WriteLine("{0} by {1}", resolution[i].Width, resolution[i].Height); 
 
      // Set the size to load, the smallest size in this case */ 
      codecs.Options.Jpeg2000.Load.J2kResolution = resolution[0]; 
 
      // Get the info in of the image to show its original size 
      CodecsImageInfo info = codecs.GetInformation(jbigFileName, false); 
      Console.WriteLine("Size of image according to GetInformation is {0} by {1}", info.Width, info.Height); 
 
      // Load the image, keeping the bits per pixel of the file 
      RasterImage image = codecs.Load(jbigFileName); 
      Console.WriteLine("Size of image loaded is {0} by {1}", image.Width, image.Height); 
 
      image.Dispose(); 
   } 
   else 
      Console.WriteLine("No resolutions found"); 
 
   // Clean up 
   codecs.Dispose(); 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Drawing 
Imports Leadtools.Svg 
 
Private Sub ReadLoadResolutionsExample(ByVal jbigFileName As String) 
   Dim codecs As RasterCodecs = New RasterCodecs() 
 
   ' Get the number of resolutions (sizes) available in this file 
   Dim resolution As LeadSize() = codecs.ReadLoadResolutions(jbigFileName) 
   If resolution.Length > 0 Then 
      Console.WriteLine("{0} resolutions available", resolution.Length) 
      Dim i As Integer = 0 
      Do While i < resolution.Length 
         Console.WriteLine("{0} by {1}", resolution(i).Width, resolution(i).Height) 
         i += 1 
      Loop 
 
      ' Set the size to load, the smallest size in this case */ 
      codecs.Options.Jpeg2000.Load.J2kResolution = resolution(0) 
 
      ' Get the info about the image to show its original size 
      Dim info As CodecsImageInfo = codecs.GetInformation(jbigFileName, False) 
      Console.WriteLine("Size of image according to GetInformation is {0} by {1}", info.Width, info.Height) 
 
      ' Load the image, keeping the bits per pixel of the file 
      Dim image As RasterImage = codecs.Load(jbigFileName) 
      Console.WriteLine("Size of image loaded is {0} by {1}", image.Width, image.Height) 
 
      image.Dispose() 
   Else 
      Console.WriteLine("No resolutions found") 
   End If 
 
   ' Clean up 
   codecs.Dispose() 
End Sub

c#[Silverlight C# Example] 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Examples; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Windows.Media; 
 
public void ReadLoadResolutionsExample(Stream inStreamJbig) 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   // Get the number of resolutions (sizes) available in this file 
   LeadSize[] resolution = codecs.ReadLoadResolutions(inStreamJbig); 
   if (resolution.Length > 0) 
   { 
      Debug.WriteLine("{0} resolutions available", resolution.Length); 
      for (int i = 0; i < resolution.Length; i++) 
         Debug.WriteLine("{0} by {1}", resolution[i].Width, resolution[i].Height); 
 
      // Set the size to load, the smallest size in this case */ 
      codecs.Options.Jpeg2000.Load.J2kResolution = resolution[0]; 
 
      // Get the info in of the image to show its original size 
      CodecsImageInfo info = codecs.GetInformation(inStreamJbig, false); 
      Debug.WriteLine("Size of image according to GetInformation is {0} by {1}", info.Width, info.Height); 
 
      // Load the image, keeping the bits per pixel of the file 
      RasterImage image = codecs.Load(inStreamJbig); 
      Debug.WriteLine("Size of image loaded is {0} by {1}", image.Width, image.Height); 
 
      image.Dispose(); 
   } 
   else 
      Debug.WriteLine("No resolutions found"); 
} 
vb[Silverlight VB Example] 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Windows.Media 
 
Public Sub ReadLoadResolutionsExample(ByVal inStreamJbig As Stream) 
   Dim codecs As RasterCodecs = New RasterCodecs() 
 
   ' Get the number of resolutions (sizes) available in this file 
   Dim resolution As LeadSize() = codecs.ReadLoadResolutions(inStreamJbig) 
   If resolution.Length > 0 Then 
      Debug.WriteLine("{0} resolutions available", resolution.Length) 
      Dim i As Integer = 0 
      Do While i < resolution.Length 
         Debug.WriteLine("{0} by {1}", resolution(i).Width, resolution(i).Height) 
         i += 1 
      Loop 
 
      ' Set the size to load, the smallest size in this case */ 
      codecs.Options.Jpeg2000.Load.J2kResolution = resolution(0) 
 
      ' Get the info in of the image to show its original size 
      Dim info As CodecsImageInfo = codecs.GetInformation(inStreamJbig, False) 
      Debug.WriteLine("Size of image according to GetInformation is {0} by {1}", info.Width, info.Height) 
 
      ' Load the image, keeping the bits per pixel of the file 
      Dim image As RasterImage = codecs.Load(inStreamJbig) 
      Debug.WriteLine("Size of image loaded is {0} by {1}", image.Width, image.Height) 
 
      image.Dispose() 
   Else 
      Debug.WriteLine("No resolutions found") 
   End If 
End Sub

Requirements

Target Platforms

Reference

RasterCodecs Class

RasterCodecs Members

Overload List

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Help Version 20.0.2020.4.3

Leadtools.Codecs Assembly

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Leadtools.Codecs Namespace

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