How can i get alpha channel from bmp image?

[Gunaamirthavelu]

Do you mean you want to alphablend an image, or do you mean you want to display the alpha channel of an image as a black and white image?

hi i am guna. i want to display the 2 images with transparensy. i can see the bottom layer image trough top layer image.similar to transparent image. plz reply as soon as possible.