How can i get alpha channel from bmp image?

hi folks

i want to display the transparensy image. so i need to reduce the 50% value in alpha channel. plz help me how can i get the alpha channel from the image. if u have any idea or sample code or any useful link help me. i am waiting for reply as soon as possible. :wave:

Thanks and regards
jay

Take a look at ::AlphaBlend().

Cheers

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?

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Originally Posted by golanshahar

Take a look at ::AlphaBlend().

Cheers

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i want to display the alpha channel image in the document view architecture can u give the sample code for geting handle of HDC hdcDest, it will work only View OnDraw() not hte other function. can u give the example for that transoarency image.plz as soon as reply.

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Originally Posted by TomWidmer

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?

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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.

Quote:

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Originally Posted by Gunaamirthavelu

i want to display the alpha channel image in the document view architecture can u give the sample code for geting handle of HDC hdcDest, it will work only View OnDraw() not hte other function. can u give the example for that transoarency image.plz as soon as reply.

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This thread might help you.

Cheers

No. my requirement is similar to montage; overlap the image with trnaparent after that i can veiw the 3d image and drawing the circle and rectangle. using GDI+ is ok. but that code worked in OnDraw() function. i want seperate function for that. display the images in document view architecture this is
not the dialog based application

Thanks andRegards.