[sane-devel] [janitorial] New backend: escl

Ulf Zibis Ulf.Zibis at gmx.de
Sun Dec 15 19:27:40 GMT 2019

OK. So it seems, the backend should be forced to png or octet-stream
(hopefully lossless), if the frontend requires to compress to TIFF.

Am 15.12.19 um 20:16 schrieb Thierry Hucard:
> No the backend receives the scanner data (the jpeg format always seems
> to be present), it can be jpeg, png, pdf or octet-stream. I didn't see
> any tiff. The data is compressed and sent back to the frontend.
> Télécharger BlueMail pour Android <http://www.bluemail.me/r?b=15726>
> Le 15 déc. 2019, à 19:56, Ulf Zibis <ulf.zibis at gmx.de
> <mailto:ulf.zibis at gmx.de>> a écrit:
>     Am 15.12.19 um 19:43 schrieb thierry at ordissimo.com:
>         Le 2019-12-15 18:34, Ulf Zibis a écrit :
>             Hi List, Am 15.12.19 um 09:10 schrieb Olaf Meeuwissen:
>                 The backend currently only supports image data
>                 transfer in JPEG format but Thierry indicated he
>                 wanted to add support for PNG and PDF as well.
>             Would it be possible to also support the TIFF format, as
>             for black&white it is the best compressing with Fax G4
>             compression?
>         I didn't see any device managing Tiff, send me the capability
>         file, I could add the support. curl
>         http://<ip>:<port>/eSCL/ScannerCapabilities or curl -k
>         https://<ip>:<port>/eSCL/ScannerCapabilities
>     In my understanding, it's not the scanner, which supports the TIFF
>     format, but it has to send raw (or lossless compressed) format, so sane
>     or the sane frontend could compress to TIFF.
>     -Ulf
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