256 color 8 bit bmp whit alpha ???

[Woodylepic]

Hi guys i have finisch all my gauges  
 
now i need to made some glass reflect on my gauges !  
to made it more cool !  
 
 
but i have a litle trouble ?  
 
my question is what programme i need for making my 256  8 bit bmp file whit alpha ?  

does imagetool can convert a psd file to a 8 bit 256 whit alpha channel ?
 
have try dxtbmp programme for making my alpha but its not working on a 8 bit 256 color texture  
 
have try bmp 2000 and image tool programme but none was able to make a 256 8 bit image whit  alpha    
 
i know that photoshop and corel draw can do a 256  8 bit image whit alpha but i have none of  this programme.  
 
is there some  litle free programme i can find some where on the web to made or convert an image in  
256/8 bit format whit alpha ?  pls help !