Simple picture transparent processing of C #

Code can be used in both WinXP and WinCE5.0. The effect is 2 graphs superimposed, the background image is unchanged, the foreground figure specifies the color to do transparent processing.

The SetColorKey is used to set the transparent color.

Graphics g = this. CreateGraphics ();

Bitmap Bitmap = new Bitmap (@ "E:/xxx/testb.png");
Bitmap bmp = new Bitmap (@ "E:/xxx/mouse.png");

imageattr = new ImageAttributes ();
Imageattr.setcolorkey (BMP. GetPixel, BMP. GetPixel (20, 20));

G.drawimage (Bitmap, new Rectangle (0, 0, bitmap.) Width, Bitmap. Height));

G.drawimage (BMP,//overlay diagram
New Rectangle (5, 8, BMP. Width, BMP. Height),//to overlay the position of the background image, size
0, 0, BMP. Width, BMP. Height,//size to be superimposed
GraphicsUnit.Pixel, imageattr); Transparent valve Value

Dispose
G.dispose ();

Background image

The graph to overlay

Actual operation effect (WinXP)