Convert(string,string,RasterImageFormat,int,int,int,int,CodecsImageInfo) Method

Summary

Converts an image file from one format to another, creating a new file in the new format.

Syntax

C++

public void Convert( 
   string srcFileName, 
   string destFileName, 
   RasterImageFormat format, 
   int width, 
   int height, 
   int bitsPerPixel, 
   int pageNumber, 
   CodecsImageInfo info 
)

Public Overloads Sub Convert( _ 
   ByVal srcFileName As String, _ 
   ByVal destFileName As String, _ 
   ByVal format As RasterImageFormat, _ 
   ByVal width As Integer, _ 
   ByVal height As Integer, _ 
   ByVal bitsPerPixel As Integer, _ 
   ByVal pageNumber As Integer, _ 
   ByVal info As CodecsImageInfo _ 
)

public: 
void Convert(  
   String^ srcFileName, 
   String^ destFileName, 
   RasterImageFormat format, 
   int width, 
   int height, 
   int bitsPerPixel, 
   int pageNumber, 
   CodecsImageInfo^ info 
)

Parameters

srcFileName
A String containing the input file name.

destFileName
A String containing the output file name.

format
The output file format. For valid values, refer to Summary of All Supported File Formats.

width
New width of the output image. If this value is not 0, then the output file will be resized to the width value. Use a value of 0 if you do not wish to resize the output file.

height
New height of the output image. If this value is not 0, then the output file will be resized to the height value. Use a value of 0 if you do not wish to resize the output file.

bitsPerPixel
The output image pixel depth. Note that not all bits per pixel are available to all file formats.

pageNumber
1-based index to the page number to convert.

info
A CodecsImageInfo object specifying more options for the conversion.

Remarks

If you convert to a lower bits-per-pixel format, this method optimizes the colors automatically. For example, when converting a 24-bit file (16 million colors) to an 8-bit file (256 colors) this method selects the best 256 colors to represent the 24-bit image

Note that this is a high-level method that does conversion from all possible formats to all possible formats.

Note: Passing 0 or -1 will convert the first page within the file.

Example

This example will convert create a RasterImage that contains as pages, thumbnails for all of the CMP images in a folder

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Svg; 
using LeadtoolsExamples.Common; 
 
public void ConvertExExample() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = false; 
 
   string srcPath = Path.Combine(LEAD_VARS.ImagesDir, "image4.gif"); 
   string destPath = Path.Combine(LEAD_VARS.ImagesDir, "JpegPages"); 
 
   if (!Directory.Exists(destPath)) 
      Directory.CreateDirectory(destPath); 
 
   //Find the page count of the file 
   CodecsImageInfo info = codecs.GetInformation(srcPath, true); 
 
   //Loop through all pages 
   for (int i = 1; i <= info.TotalPages; ++i) 
   { 
      //Set the file name for the new image file 
      string name = Path.GetFileNameWithoutExtension(srcPath); 
      string destFileName = Path.Combine(destPath, name + "_page" + i + ".jpeg"); 
 
      // Delete the image if its already there 
      if (File.Exists(destFileName)) 
         File.Delete(destFileName); 
 
      //Convert each page to a new JPEG file 
      codecs.Convert(srcPath, destFileName, RasterImageFormat.Jpeg, 0, 0, 24, i, info); 
   } 
 
   // Clean up 
   codecs.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images"; 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Drawing 
Imports Leadtools.Svg 
 
Public Sub ConvertExExample() 
   Dim codecs As New RasterCodecs() 
   codecs.ThrowExceptionsOnInvalidImages = False 
 
   Dim srcPath As String = Path.Combine(LEAD_VARS.ImagesDir, "image4.gif") 
   Dim destPath As String = Path.Combine(LEAD_VARS.ImagesDir, "JpegPages") 
 
   If Not Directory.Exists(destPath) Then 
      Directory.CreateDirectory(destPath) 
   End If 
 
   'Find the page count of the file 
   Dim info As CodecsImageInfo = codecs.GetInformation(srcPath, True) 
 
   'Loop through all pages 
   For i As Integer = 1 To info.TotalPages 
      'Set the file name for the new image file 
      Dim name As String = Path.GetFileNameWithoutExtension(srcPath) 
      Dim destFileName As String = Path.Combine(destPath, name & "_page" & i & ".jpeg") 
 
      ' Delete the image if its already there 
      If File.Exists(destFileName) Then 
         File.Delete(destFileName) 
      End If 
 
      'Convert each page to a new JPEG file 
      codecs.Convert(srcPath, destFileName, RasterImageFormat.Jpeg, 0, 0, 24, i, info) 
   Next 
 
   ' Clean up 
   codecs.Dispose() 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images" 
End Class

Requirements

Target Platforms

Reference

RasterCodecs Class

RasterCodecs Members

Overload List

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Help Version 20.0.2020.4.3