Convert EPUB to GIF | C#

GIF is a popular image format that is frequently used in web publishing. With Aspose.HTML, you can convert EPUB to GIF format programmatically with full control over a wide range of conversion parameters. In this article, you find information on how to convert EPUB to GIF using ConvertEPUB() methods of the Converter class, and how to apply ImageSaveOptions and ICreateStreamProvider parameters.

Online EPUB Converter

You can check the Aspose.HTML API functionality and convert EPUB in real-time. Please load an EPUB file from the local file system, select the output format and run the example. In the example, the save options are set by default. You will immediately receive the result as a separate file.

Code example in C# to convert document formats
Input file
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Output format
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If you want to convert EPUB to GIF programmatically, please see the following C# code examples.

Convert EPUB to GIF

Using Converter.ConvertEPUB methods is the most common way to convert EPUB files into various formats. You should follow a few steps:

  1. Open an existing EPUB file. In the example, we use the OpenRead() method of System.IO.FileStream class to open and read an EPUB file from the file system at the specified path.
  2. Create a new ImageSaveOptions object with GIF ImageFormat. By default, the Format property is PNG.
  3. Use the ConvertEPUB() method of the Converter class to save EPUB as a GIF image. You need to pass the EPUB file stream, ImageSaveOptions, and output file path to the ConvertEPUB() method for EPUB to GIF conversion.

Please take a look over the following C# code snippet which shows the process of converting EPUB to GIF using Aspose.HTML for .NET.

using System.IO;
using Aspose.Html;
using Aspose.Html.Converters;
using Aspose.Html.Rendering.Image;
using Aspose.Html.Saving;
...
  // Open an existing EPUB file for reading
  using var stream = File.OpenRead(DataDir + "input.epub");

  // Prepare a path for converted file saving 
  string savePath = Path.Combine(OutputDir, "input-output.gif");

  // Initialize ImageSaveOptions 
  var options = new ImageSaveOptions(ImageFormat.Gif);

  // Call the ConvertEPUB method to convert EPUB to GIF
  Converter.ConvertEPUB(stream, options, savePath);

Save Options

Aspose.HTML allows converting EPUB to GIF using default or custom save options. ImageSaveOptions usage enables you to tune the rendering process. You can specify the page size, margins, horizontal/vertical resolution, etc.

Property Description
Compression Sets Tagged Image File Format (TIFF) Compression. By default, this property is LZW.
CSS Gets a CssOptions object which is used for configuration of CSS properties processing.
Format Sets the ImageFormat (JPG, PNG, BMP, TIFF, or GIF). By default, this property is PNG.
BackgroundColor This property sets the color that will fill the background. By default, this property is Transparent.
PageSetup This property gets a page setup object and uses it for configuration output page-set.
HorizontalResolution Sets horizontal resolution for output images in pixels per inch. The default value is 300 dpi.
VerticalResolution Sets vertical resolution for output images in pixels per inch. The default value is 300 dpi.
SmoothingMode This property sets the rendering quality for this image. Available values are Invalid, Default, HighSpeed, HighQuality, None, and AntiAlias.
Text Gets a TextOptions object which is used for configuration of text rendering.

Convert EPUB to GIF using ImageSaveOptions

To convert EPUB to GIF with ImageSaveOptions specifying, you should follow a few steps:

  1. Open an existing EPUB file.
  2. Create a new ImageSaveOptions object and specify save options.
  3. Use the ConvertEPUB() method of the Converter class to save EPUB as a GIF image. You need to pass the EPUB file stream, ImageSaveOptions, and output file path to the ConvertEPUB() method to convert EPUB to GIF.

The following C# code snippet shows how to convert EPUB to GIF using custom save options:

using System.IO;
using Aspose.Html;
using Aspose.Html.Converters;
using Aspose.Html.Rendering.Image;
using Aspose.Html.Saving;
using System.Drawing;
using Aspose.Html.Drawing;
using System.Drawing.Drawing2D;
...
    // Open an existing EPUB file for reading
    using var stream = File.OpenRead(DataDir + "input.epub");

    // Prepare a path for converted file saving 
    string savePath = Path.Combine(OutputDir, "input-options.gif");
    
    // Initialize ImageSaveOptions 
    var options = new ImageSaveOptions(ImageFormat.Gif)
    {
        SmoothingMode = SmoothingMode.HighQuality,
        HorizontalResolution = 400,
        VerticalResolution = 400,
        BackgroundColor = Color.AliceBlue
    };
    options.PageSetup.AnyPage = new Page(new Aspose.Html.Drawing.Size(800, 500), new Margin(30, 20, 10, 10));
    
    // Call the ConvertEPUB method to convert EPUB to GIF
    Converter.ConvertEPUB(stream, options, savePath);

The ImageSaveOptions() constructor initializes an instance of the ImageSaveOptions class that is passed to ConvertEPUB() method. The ConvertEPUB() method takes the stream, options, output file path savePath and performs the conversion operation.

In the example, we use:

  • HorizontalResolution and VerticalResolution properties that set horizontal/vertical resolution for output images in pixels per inch. By default, these properties are 300 dpi;
  • SmoothingMode property that sets the rendering quality for this image;
  • BackgroundColor property that specifies the color that the background will be filled in. The default BackgroundColor is Transparent;
  • PageSetup property that specifies the page size and margins in pixels.

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