---
title: "EpsWriter.AlphaThreshold Property "
canonical: https://www.graphicsmill.com/docs/gm/P_Aurigma_GraphicsMill_Codecs_EpsWriter_AlphaThreshold.htm
product: "Graphics Mill"
---

# EpsWriter.AlphaThreshold Property 
 
Gets or sets an alpha threshold for this [EpsWriter](https://www.graphicsmill.com/docs/gm/T_Aurigma_GraphicsMill_Codecs_EpsWriter.htm.md).
 
**Namespace:** [Aurigma.GraphicsMill.Codecs](https://www.graphicsmill.com/docs/gm/N_Aurigma_GraphicsMill_Codecs.htm.md)
 **Assembly:** Aurigma.GraphicsMill (in Aurigma.GraphicsMill.dll)
 
## Syntax
  
```csharp
public float AlphaThreshold { get; set; }
```
 
### Property Value
An alpha threshold for this [EpsWriter](https://www.graphicsmill.com/docs/gm/T_Aurigma_GraphicsMill_Codecs_EpsWriter.htm.md).
 
## Remarks
  
An image, drawn on the EPS document, may have the alpha channel specifying an opacity degree for each pixel. However, the EPS format cannot handle semi-transparency, that is, each pixel on EPS images can be displayed with full opacity or fully transparent. [EpsWriter](https://www.graphicsmill.com/docs/gm/T_Aurigma_GraphicsMill_Codecs_EpsWriter.htm.md) allows you to specify a threshold for transparency. Alpha threshold values are accepted in the range `[0, 1]`. If a pixel alpha value is greater than the threshold value, the pixel will be fully opaque; otherwise, it will be fully transparent.
 
## Examples
  
```csharp
using (var bitmap = new Bitmap(200, 151, PixelFormat.Format32bppArgb, new RgbColor(255, 255, 255, 20)))
using (var graphics = bitmap.GetGraphics())
{
    graphics.DrawImage(new Bitmap(@"Images\RgbImage.jpg"), new System.Drawing.RectangleF(8, 8, 184, 136));
    //Draw a rectangle with transparency.
    var pen = new Pen(new RgbColor(0, 88, 0, 150), 8);
    graphics.DrawRectangle(pen, 4, 4, 192, 143);

    bitmap.Save(@"Images\Output\out.png");
}
```
   
## See Also

### Reference

- [EpsWriter Class](https://www.graphicsmill.com/docs/gm/T_Aurigma_GraphicsMill_Codecs_EpsWriter.htm.md)
- [Aurigma.GraphicsMill.Codecs Namespace](https://www.graphicsmill.com/docs/gm/N_Aurigma_GraphicsMill_Codecs.htm.md)

### Manual

- [Working with EPS](https://www.graphicsmill.com/docs/gm/working-with-eps.htm.md)