RAW files are not really a graphic format but a representation of the data the camra sensor captured. You have to "develop" (convert) the RAWs in a graphic format first. You can do that in many different applications, PS, Canon DPP, ACR , Capture One, DxO etc etc. When you develop the RAWs save/convert them to 16 bit tiff files.
If you read an 8 bit file in PS and use edit->convert to 16 bits you are stil in 8 bits mode. It's like having a number in 2 decimals format and converting to 4 decimals, you have to start with the 4 decimals!
Hope it helps.
Luis
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