Using GDI+ to crop PNGs without loosing their transparency

[EFileTahi-A]

I can crop them easly but the minute I draw it back it becomes opaque

Bitmap bitSize = new Bitmap(32, 32);
Image pic = Bitmap.FromFile(sCurrentFile,true);
Graphics g = Graphics.FromImage(bitSize);
g.DrawImage(pic, dstRectangle, srcRectangle, GraphicsUnit.Pixel) ;

I really dont know how to make it working, I think when I load the image to the Bitmap object it simply looses its tranparency alpha channel, no?

 

[snarfblam]

Try explicitly specifying an ARGB format in the Bitmap constructor . If that doesnt work, try setting the compositing mode of the graphics object to CompositingMode.SourceCopy. The default is SourceOver, which performs an alpha blend. SourceCopy copies the alpha data instead of blending it.

 

[EFileTahi-A]

Oh.. I made it... Actually I was begin stupid. It works now, even without using your methods... Thanks anyway Marble