[sane-devel] SANE_FRAME_IR

[m. allan noah]

We already have a SANE_FRAME_JPEG and SANE_FRAME_IR in sane.h, but they are
commented out because we could not agree on bumping the library version
number. I bet you could find some ancient, and sometimes heated discussions
in the archives of this mailing list.

allan

On Wed, Jul 22, 2026 at 7:49 PM Benjamin Gordon <bmgordon at chromium.org>
wrote:

> On Wed, Jul 22, 2026 at 11:33 AM Ralph Little <skelband at gmail.com> wrote:
>
>> Hi,
>> We have had a question from a developer regarding support for IR from a
>> scanner, namely the LS-5000 supported by the coolscan3 backend.
>> This device can supply IR but there are a few different ways in which
>> this can be delivered to the frontend. The brief discussion is here:
>> https://gitlab.com/sane-project/backends/-/merge_requests/937
>>
>> As I said in that discussion, I believe the SANE_FRAME_IR option (or
>> some variant) is the better one to explicitly support it from the SANE
>> standard. I assume that this was a proposed extension at some point.
>> However, this would mean we would need to ratify a new standard and ask
>> frontend developers to support the new features, something that we might
>> struggle to do ourselves what with the backlog we currently have.
>>
>> There are mentioned some other options, such as delivering the IR frame
>> as grey in the next frame, which is done currently by another backend,
>> and has the advantage of being supported right now.
>>
>> Views? Any appetite for an update to the SANE Standard? I'm sure there
>> are a few things that people would like to add.
>>
>
> If there's the possibility of re-opening the standard, I for one would
> like to consider a more general handling of frame formats.  All the
> scanners that support eSCL these days can return JPEG directly, and some of
> them can even return a whole PDF at once.  It would be great for the
> frontend to be able to negotiate some sort of passthrough mode instead of
> decoding these and then re-encoding in the frontend.
>
> Thanks,
> Benjamin
>
>

-- 
"well, I stand up next to a mountain- and I chop it down with the edge of
my hand"
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