[Gdal-dev] band concept of GDAL data model

[wang liyan]

 Hi,

   What I want is to change a one-band image into a image with 4 bands 
image.
   
I have already read the image data by using RasterIO method,the type of 
origion 

image is GDT_Byte.Then how to create an 4 bands image which type is 
GDT_Float32?

I have read the GDAL data model for several times.But i don't quiet 
understand it.

Can any experts help me?

    Thanks in advanced!
    
                                    jeff

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