[sane-devel] scanning negatives using HP4850 and genesys backend

[7xsuazlhhtls at gmail.com]

Ralph,

Thanks for the reply.

I looked at the Genesys Datasheet for the chip (GL646USB) that is used 
in the HP4850.  I see the register that appears to control the slide 
scanning lamp.

Is there another backend that has support for a similar feature? 
Possibly I could use that as a template to better understand how support 
for this feature might be implemented in the genesys backend.

Thanks again,

Jon


On 7/31/26 11:21 AM, Ralph Little wrote:
> Hi,
> According to our Supported Scanners list 
> (http://www.sane-project.org/sane-supported-devices.html) the genesys 
> backend doesn't yet support the slide scanning feature of this device. 
> It requires additional code to drive the extra hardware involved.
> We don't have an active maintainer for the genesys backend at the 
> moment unfortunately, so I don't know when someone would be able to 
> get to this task in the future. :(
>
> Regards,
> Ralph
>
> On 2026-07-30 20:58, 7xsuazlhhtls at gmail.com wrote:
>>
>> |I recently acquired an HP Scanjet 4850 scanner.  The document 
>> scanning works with no problems.  This particular scanner has a 
>> negative/slide scanning component built in to the lid of the device.  
>> This includes a separate lamp to illuminate the film for scanning.  
>> The lamp in the lid comes when I run a hardware self test procedure 
>> but I have not discovered any way to have the lamp come on when 
>> scanning using sane.
>>
>> Is this capability supported?
>>
>> info about my setup ---
>>
>> HP Scanjet 4850
>>
>> $ scanimage -V
>> scanimage (sane-backends) 1.4.0; backend version 1.4.0
>>
>> genesys backend
>>
>> Fedora Linux 44 (Workstation Edition)
>> Linux 7.1.5-200.fc44.x86_64|
>>
>
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