[sane-devel] RFC: SANE2 and previews

[Oliver Rauch]

Hi.

I will add it to the todo list.

Bye
Oliver

Major A schrieb:
> 
> Another suggestion for SANE2:
> 
> In sane_control_option(), the info passed back in *i should allow the
> backend to ask for the preview to become invalid. I think this would
> be useful for backends which can change something fundamental (like
> exposure) that changes the way the image is scanned. This is not
> essential, it would just make the interface more idiot-proof: a
> frontend could mark the preview as invalid (with a red line through it
> or similar -- not by deleting the preview!) to indicate that the image
> to be scanned will be different from the one in the preview.
> 
> Therefore, how about SANE_INFO_INVALIDATE_PREVIEW ?
> 
> We could also go for a more elaborate approach which allows the
> backend to request corrections to the preview. If, for example, red
> channel exposure is increased by a factor of 1.2, it would be possible
> to correct the preview without scanning a new one. (Note: this could
> be the exposure time of the scanner, which is independent of the
> LUTs.) Any suggestions?
> 
>   Andras
> 
> ===========================================================================
> Major Andras
>     e-mail: andras at users.sourceforge.net
>     www:    http://andras.webhop.org/
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