[sane-devel] Image Compression doesn't support in SANE protocal

René Rebe rene at exactcode.de
Tue Aug 22 12:56:17 UTC 2006

On Aug 22, 2006, at 2:51 PM, m. allan noah wrote:

> now that many low-end scanners support jpeg natively (some ONLY do  
> jpeg!) i expect we will see more need for this.


> as a short term fix, rather than adding a new sane_frame type, the  
> backend can extract the compressed data, convert to raw bitmap.  
> then frontend can convert to any compressed format it wants. this  
> is not as efficient as keeping the compressed version the entire  
> way through, but it works now.
> dell networked scanner backend works this way.

Well that stinks as you lose a lot of detail with the lossy jpeg  

Maybe let's add the JPEG frame type rather soon (even in SANE 1) and  
let's add an IR (infra red) frame specification on the way as good  
film scanner deliver for dust and the-like removal.


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