Save(RasterImage,Stream,RasterImageFormat,int,int,int,int,CodecsSavePageMode) Method

Summary

Saves one or more pages of a RasterImage to a stream in any of the supported compressed or uncompressed formats.

Syntax

Objective-C

C++/CLI

Java

Python

public void Save( 
   RasterImage image, 
   Stream stream, 
   RasterImageFormat format, 
   int bitsPerPixel, 
   int firstPage, 
   int lastPage, 
   int firstSavePageNumber, 
   CodecsSavePageMode pageMode 
)

- (BOOL)       save:(LTRasterImage *)image  
             stream:(LTLeadStream *)stream  
             format:(LTRasterImageFormat)format  
       bitsPerPixel:(NSInteger)bitsPerPixel  
          firstPage:(NSInteger)firstPage  
           lastPage:(NSInteger)lastPage  
firstSavePageNumber:(NSInteger)firstSavePageNumber  
           pageMode:(LTCodecsSavePageMode)pageMode  
              error:(NSError **)error

public void save(RasterImage image, ILeadStream stream, RasterImageFormat format, int bitsPerPixel, int firstPage, int lastPage, int firstSavePageNumber, CodecsSavePageMode pageMode)

public: 
void Save(  
   RasterImage^ image, 
   Stream^ stream, 
   RasterImageFormat format, 
   int bitsPerPixel, 
   int firstPage, 
   int lastPage, 
   int firstSavePageNumber, 
   CodecsSavePageMode pageMode 
)

def Save(self,pageMode):

Parameters

image
The RasterImage object that holds the image data.

stream
A Stream where the image data will be saved.

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

bitsPerPixel
Resulting file's pixel depth. Note that not all bits per pixel are available to all file formats. For valid values, refer to Summary of All Supported File Formats. If bitsPerPixel is 0, the image will be stored using the closest bits/pixel value supported by that format. For example, if a file format supports 1, 4, and 24 bits/pixel, and RasterImage.BitsPerPixel is 5, the file will be stored as 24 bit. Likewise, if RasterImage.BitsPerPixel is 2, the file will be stored as 4 bit.

firstPage
1-based index of the first page in image to save.

lastPage
1-based index of the last page in image to save. Pass -1 to save from firstPage to the last page in image.

firstSavePageNumber
1-based index of the first output page. If the output file already exists, then this parameter lets you control which pages to overwrite and/or where to append the new pages.

pageMode
Determines how to handle the page when saving to multipage formats. This can be one of the following:

Value	Meaning
CodecsSavePageMode.Append	Append the new page(s) to the end of the file. If the file does not exist, this option will create the file and add the pages to it. firstSavePageNumber is not used.
CodecsSavePageMode.Insert	Insert the new page(s) at the index specified by firstSavePageNumber.
CodecsSavePageMode.Replace	Replace the page(s) starting at the index specified by firstSavePageNumber.
CodecsSavePageMode.Overwrite	Overwrite the page(s) starting at the index specified by firstSavePageNumber.

Remarks

If the image is 8 bits per pixel or greater, use the LEAD CMP format or one of the JPEG (JTIF or JFIF) formats to save disk space.

If the image is 1-bit per pixel, use the LEAD 1-bit format or a CCITT Group 3 or 4 format to save disk space.

If the image has a region, the region stored in the image will be saved, if the image is saved as one of the TIFF file formats. Note, however, that the ability to save a region inside a TIFF file must be unlocked. This requires a Document Imaging or Document Imaging toolkit. /// For more information, refer to Saving A Region.

Only TIFF and DICOM file formats are capable of saving images that have been window-leveled. Images can be window-leveled by calling RasterImage.WindowLevel and specifying RasterWindowLevelMode.PaintAndProcessing, by using the WindowLevelCommand or by loading an image from a file format that supports Window Leveling. If a window-leveled image is saved as any other file format, the image data will be converted before being saved. For more information, refer to Saving Window-Leveled Images.

Use the CodecsSaveOptions class to set up other save options parameters before calling this method.

Use FormatSupportsMultipageSave to determine if the format supports saving into a multipage file.

Use the SaveImage event to provide progress feedback or to set or modify the saved image data.

This method supports signed data images, but only DICOM and TIFF formats support signed data. This method will throw an exception if you attempt to save a signed image to a format other than DICOM or TIFF.

In LEADTOOLS version 17 and up, when saving a colored image (such as a 24-bits per pixel image) to bitonal (1-bit per pixel), the RasterCodecs object will not use any dithering when converting the image data. This is done because dithering is not the recommended when converting colored images containing text for document processing such as OCR and Barcode. The resulting text will be fuzzy and hard for a recognition engine to process. To save a colored image as bitonal with Floyd-Stein dithering (the behavior of LEADTOOLS 16.5 and earlier) use CodecsSaveOptions.UseImageDitheringMethod along with RasterImage.DitheringMethod as illustrated below:

// 'codecs' is the RasterCodecs to use when saving 
// 'image' is a colored RasterImage object 
// Setup FloydStein dithering: 
codecs.Options.Save.UseImageDitheringMethod = true; 
image.DitheringMethod = RasterDitheringMethod.FloydStein; 
// Save the image as 1-bpp with auto-dithering: 
codecs.Save(image, fileName, RasterImageFormat.Tif, 1);

For information about quality factors, refer to Compression Quality Factors.

Example

This example will create a multipage image and save it to a stream before using the Save method to insert and replace pages directly in the file.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Svg; 
 
 
public void SaveStream2Example() 
{ 
   RasterCodecs codecs = new RasterCodecs(); 
 
   string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_SaveStream2.tif"); 
 
   // Create a RasterImage with 4 pages containing text showing the page number 
   RasterImage image = null; 
   const int pageCount = 4; 
 
   using (System.Drawing.Font f = new System.Drawing.Font("Arial", 36, System.Drawing.FontStyle.Bold)) 
   using (System.Drawing.Bitmap btmp = new System.Drawing.Bitmap(320, 200)) 
   using (System.Drawing.StringFormat sf = new System.Drawing.StringFormat()) 
   { 
      System.Drawing.Rectangle rc = new System.Drawing.Rectangle(0, 0, btmp.Width, btmp.Height); 
      sf.Alignment = System.Drawing.StringAlignment.Center; 
      sf.LineAlignment = System.Drawing.StringAlignment.Center; 
 
      for (int i = 1; i <= pageCount; i++) 
      { 
         // Create a GDI+ bitmap with the text 
         string text = "Page " + i; 
 
         using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(btmp)) 
         { 
            g.FillRectangle(System.Drawing.Brushes.White, rc); 
            g.DrawString(text, f, System.Drawing.Brushes.Black, rc, sf); 
         } 
 
         RasterImage tempImage = Leadtools.Drawing.RasterImageConverter.ConvertFromImage(btmp, Leadtools.Drawing.ConvertFromImageOptions.None); 
 
         if (image == null) 
            image = tempImage; 
         else 
            image.AddPage(tempImage); 
      } 
   } 
 
   // Save all the pages to the a stream 
   FileStream fs = File.Create(destFileName); 
 
   // The file should have 4 pages now: 1, 2, 3, 4 
   codecs.Save(image, fs, RasterImageFormat.Tif, 1, 1, pageCount, 1, CodecsSavePageMode.Overwrite); 
   image.Dispose(); 
 
   // Load the 3rd page and insert it as the second 
   // The file should have 5 pages now: 1, 3, 2, 3, 4 
   image = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, 3, 3); 
   codecs.Save(image, fs, RasterImageFormat.Tif, 1, 1, 1, 2, CodecsSavePageMode.Insert); 
   image.Dispose(); 
 
   // Load the last page, and insert it as the first 
   // The file should have 5 pages now: 4, 1, 3, 2, 3, 4 
   image = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, 5, 5); 
   codecs.Save(image, fs, RasterImageFormat.Tif, 1, 1, 1, 1, CodecsSavePageMode.Insert); 
   image.Dispose(); 
 
   // Replace the 5th page with the 2nd 
   // The file should have 5 pages now: 4, 1, 3, 2, 1, 4 
   image = codecs.Load(fs, 0, CodecsLoadByteOrder.BgrOrGray, 2, 2); 
   codecs.Save(image, fs, RasterImageFormat.Tif, 1, 1, 1, 5, CodecsSavePageMode.Replace); 
   image.Dispose(); 
 
   // We will delete pages now from the file 
   // LEADTOOLS does not support deleting pages from 
   // a stream, so we have to close it now and use 
   // the file instead. 
   fs.Close(); 
 
   // Delete the 2nd and 6th pages 
   // The file should have 5 pages now: 4, 3, 2, 1 
   codecs.DeletePage(destFileName, 2); 
   // Notice, -1 because we already deleted a page, so 6th page is not 5th 
   codecs.DeletePage(destFileName, 6 - 1); 
 
   // Clean up 
   codecs.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}