---
title: "ChannelsProvider.Transparentize Method "
canonical: https://www.graphicsmill.com/docs/gm/M_Aurigma_GraphicsMill_ChannelsProvider_Transparentize_2_d079cd70.htm
product: "Graphics Mill"
---

# ChannelsProvider.Transparentize Method 
 
Sets alpha values of pixels with a given color (and tolerant ones) to transparent.
 
**Namespace:** [Aurigma.GraphicsMill](https://www.graphicsmill.com/docs/gm/N_Aurigma_GraphicsMill.htm.md)
 **Assembly:** Aurigma.GraphicsMill (in Aurigma.GraphicsMill.dll)
 
## Syntax
  
```csharp
public void Transparentize(Color backgroundColor,float threshold
)
```
 
### Parameters
 
 - backgroundColor
     - Type: [Aurigma.GraphicsMill.Color](https://www.graphicsmill.com/docs/gm/T_Aurigma_GraphicsMill_Color.htm.md)

 - threshold
     - Type: System.Single
The threshold in range [0, 1].
 
## Remarks
 This method is very useful when you need to blend two images and "upper" image does not have alpha channel, but it has a background color. For example, you draw a logo placed in the center of the image on white background. In this case you set *bgColor* to white color. You can also adjust a *threshold* parameter to make colors close to white color semi-transparent (to get smooth colors). Besides of that threshold is useful when background color is not completely uniform (for example, you loaded JPEG file with low quality).
 
## Examples
  
```csharp
bitmap.Channels.Transparentize(RgbColor.LightBlue, 0.3f);
```
   
## See Also

### Reference

- [ChannelsProvider Class](https://www.graphicsmill.com/docs/gm/T_Aurigma_GraphicsMill_ChannelsProvider.htm.md)
- [Aurigma.GraphicsMill Namespace](https://www.graphicsmill.com/docs/gm/N_Aurigma_GraphicsMill.htm.md)