---
title: "WBMP File Format"
canonical: https://www.graphicsmill.com/docs/gm5/WBMPFileFormat.htm
product: "Graphics Mill 5.5 for .NET"
---

This documentation is for the old version. [Go to the latest Graphics Mill docs](https://www.graphicsmill.com/docs/gm/)

# WBMP File Format
 
The Wireless Application Protocol Bitmap Format (WBMP) is designed for use with applications that operate over wireless communication networks. The WBMP format is commonly used in mobile phones (WAP phones) and enables graphical information to be sent to the handset. This format is very simple and allows to store image only in 1-bit format (black and white).
 
## Format Name
  
WBMP
 
## MIME Type
  
image/vnd.wap.wbmp
 
## File Extensions
  
\*.wbmp
 
## Supported Pixel Formats
  
|  Description |  Read |  Write |
| --- | --- | --- |
 |  1 bit palette-based |  Yes |  Yes |
 
## Examples
  
This code example demonstrates how to convert a JPEG image into the WBMP. Draw attention, to be able to save to the WBMP format, we need to reduce colors to 1-bit color depth first.
 
```
Dim bitmap As New Aurigma.GraphicsMill.Bitmap("c:\Mountain.jpg")

bitmap.ColorManagement.ConvertToIndexed(1, Aurigma.GraphicsMill.ColorPaletteType.Bicolor, _
    Nothing)

bitmap.Save("C:\Mountain.wbmp", _
    New Aurigma.GraphicsMill.Codecs.WbmpEncoderOptions)

bitmap.Dispose()
```
 
```csharp
using (Aurigma.GraphicsMill.Bitmap bitmap = 
           new Aurigma.GraphicsMill.Bitmap(@"c:\Mountain.jpg"))
{
    bitmap.ColorManagement.ConvertToIndexed(1, Aurigma.GraphicsMill.ColorPaletteType.Bicolor, 
        null);

    bitmap.Save(@"C:\Mountain.wbmp", 
        new Aurigma.GraphicsMill.Codecs.WbmpEncoderOptions());
}
```
 
The code below does the same, but using [WbmpWriter](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_Codecs_WbmpWriter.htm.md) class. This class provides more flexible file saving support. In particular, you can use an asynchronous mode.
 
```
Dim bitmap As New Aurigma.GraphicsMill.Bitmap("c:\Mountain.jpg")

bitmap.ColorManagement.ConvertToIndexed(1, Aurigma.GraphicsMill.ColorPaletteType.Bicolor, _
    Nothing)

Dim writer As New Aurigma.GraphicsMill.Codecs.WbmpWriter("C:\Mountain.wbmp")

Dim frame As New Aurigma.GraphicsMill.Codecs.WbmpFrame

frame.SetBitmap(bitmap)

bitmap.Dispose()

writer.AddFrame(frame)

frame.Dispose()

writer.Dispose()
```
 
```csharp
using (Aurigma.GraphicsMill.Bitmap bitmap = 
           new Aurigma.GraphicsMill.Bitmap(@"c:\Mountain.jpg"))
{
    bitmap.ColorManagement.ConvertToIndexed(1, Aurigma.GraphicsMill.ColorPaletteType.Bicolor, 
        null);

    using (Aurigma.GraphicsMill.Codecs.WbmpWriter writer = 
        new Aurigma.GraphicsMill.Codecs.WbmpWriter())
    {            
        using (Aurigma.GraphicsMill.Codecs.WbmpFrame frame = 
                   new Aurigma.GraphicsMill.Codecs.WbmpFrame())
        {
            frame.SetBitmap(bitmap);

            writer.AddFrame(frame);
        }
    }
}
```