---
title: "TiffExtraChannel Constructor (Bitmap, TiffChannelType)"
canonical: https://www.graphicsmill.com/docs/gm5/C_Aurigma_GraphicsMill_Codecs_TiffExtraChannel_ctor_2_fb71ad05.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/)

# TiffExtraChannel Constructor (Bitmap, TiffChannelType)
 
Creates and initializes new [TiffExtraChannel](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_Codecs_TiffExtraChannel.htm.md) class instance. You can associate a bitmap with this extra channel as well as set its type here.
 
**Namespace:** [Aurigma.GraphicsMill.Codecs](https://www.graphicsmill.com/docs/gm5/N_Aurigma_GraphicsMill_Codecs.htm.md)
 **Assembly:** Aurigma.GraphicsMill (in Aurigma.GraphicsMill.dll)
 
## Syntax
  
```
Public Sub New ( _bitmap As Bitmap, _channelType As TiffChannelType _
)
```
 
```csharp
public TiffExtraChannel(Bitmap bitmap,TiffChannelType channelType
)
```
 
### Parameters
 
 - bitmap
     - Type: [Aurigma.GraphicsMill.Bitmap](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_Bitmap.htm.md)
 [Bitmap](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_Bitmap.htm.md) class instance which should be associated with this extra channel. To put another bitmap into channel, you should use [SetBitmap(Bitmap)](https://www.graphicsmill.com/docs/gm5/M_Aurigma_GraphicsMill_Codecs_TiffExtraChannel_SetBitmap_1_fd4033ef.htm.md) method.

 - channelType
     - Type: [Aurigma.GraphicsMill.Codecs.TiffChannelType](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_Codecs_TiffChannelType.htm.md)
Value that specifies necessary TIFF extra channel type. You can change it later using [ChannelType](https://www.graphicsmill.com/docs/gm5/P_Aurigma_GraphicsMill_Codecs_TiffExtraChannel_ChannelType.htm.md) property.
   
## See Also

### Reference

- [TiffExtraChannel Class](https://www.graphicsmill.com/docs/gm5/T_Aurigma_GraphicsMill_Codecs_TiffExtraChannel.htm.md)
- [TiffExtraChannel Overload](https://www.graphicsmill.com/docs/gm5/O_T_Aurigma_GraphicsMill_Codecs_TiffExtraChannel_ctor.htm.md)
- [Aurigma.GraphicsMill.Codecs Namespace](https://www.graphicsmill.com/docs/gm5/N_Aurigma_GraphicsMill_Codecs.htm.md)