[sane-devel] [announce] coolscan3 release

[Jonathan Buzzard]

René Rebe wrote:
> Hi,
> 
> now that was a fast reply :-)
> 
> On 17.12.2007, at 10:31, Alessandro Zummo wrote:
> 
>> On Mon, 17 Dec 2007 10:29:03 +0100
>> René Rebe <rene at exactcode.de> wrote:
>>
>>> Hey Alessandro,
>>>
>>> I just spotted the infrared option. I wonder how you output the  
>>> infra-
>>> red
>>> data?
>>
>>> In the Avision backend I recently added infrared support but so far I
>>> just output two frames, one with the infra-red channel(s) and the  
>>> other
>>> one with the ordinary image data.
>>>
>>> What is your backend doing?
>>
>> alongside RGB data and this is why you need my program tiffscan
>> to read it. that's why the bakend is experimental and not
>> suited for mainstream sane. I defined a new frame type,
>> SANE_FRAME_RGBX for it.
> 
> Ah, ok. We recently added SANE_FRAME_JPEG, and in that
> discussion I proposed GRAYI and RGBI.
> 
> What is the data format of your scanner? The Avision based ones
> return a infra-red value for each R, G and B sensor, not just one
> value per pixel, so I get: R,RI,G,GI,B,BI. I can imagine other devices
> just return one I sample per pixel.
> 
> We should take that into account before adding some official
> frame format to the SANE stanard.
> 

The inability of the SANE standard to accept an IR channel is something 
that came up at over seven years ago on this list!!!

Perhaps one day I will be able to dump Vuescan for something that is 
open source. However given that I have been waiting seven years for this 
and SANE still has not got around to including the ability to scan the 
IR channel in the standard I am not holding my breath.

In the meantime my copy of Vuescan is one of the best software purchases 
I have ever made.


JAB.

-- 
Jonathan A. Buzzard                 Email: jonathan (at) buzzard.me.uk
Northumberland, United Kingdom.       Tel: +44 1661-832195