How to created non-transparent & mask bitmap from a alpha-png?

[K9998]

Hi,I'm trying to split a Alpha-PNG with two bitmaps(.bmp).

 

One is non-transparent bitmap(24Bit) and another is mask(8 Bit).

 

How to make it happend in C# or VB.net?

[K9998]

I have an idea below:

 

for (int Xcount = 0; Xcount < Bit.Width; Xcount++)
           {
               for (int Ycount = 0; Ycount < Bit.Height; Ycount++)
               {
                   
                    //Do same decide

                   
               }
           }

 

 

But I don't know how to deal with translucence part.

[K9998]

I've already done this job.:)