Gets or sets an alpha threshold for this EpsWriter.
Namespace:
Aurigma.GraphicsMill.Codecs
Assembly:
Aurigma.GraphicsMill (in Aurigma.GraphicsMill.dll)
public float AlphaThreshold { get; set; }
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 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.
using (var bitmap = new Bitmap(200, 151, PixelFormat.Format32bppArgb, new RgbColor(255, 255, 255, 20)))
using (var graphics = bitmap.GetAdvancedGraphics())
{
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");
}