[Openexr-devel] OpenEXR vs Raw images

[nkb]

Hi.
I've a simple question.
Does storing my images in OpenEXR present any advantages over storing my 
images as Raw images (such as the CRW format from Canon digtial camera)?
I did a simple comparision. In terms of file size, for the same image, 
canon crw file size (in my example) is 4.7MB while openexr format with 
piz compression yields a result of 12.8MB. Further, in terms of being 
able to control the exposure levels, tuning the images with various 
details, crw format seems to have more controls and I'm able to get the 
right image out of a CRW file.(I use photoshop CS) So what am I missing 
here? Thanks.