Image Compression doesn't support in SANE protocal

now that many low-end scanners support jpeg natively (some
ONLY do jpeg!) 
i expect we will see more need for this.

as a short term fix, rather than adding a new sane_frame
type, the backend 
can extract the compressed data, convert to raw bitmap. then
frontend can 
convert to any compressed format it wants. this is not as
efficient as 
keeping the compressed version the entire way through, but
it works now.

dell networked scanner backend works this way.

allan

On Tue, 22 Aug 2006, zf wrote:

>    Yes, xsane can save file in a compressed format. But
before that we must decompress the data from scanner and
then transfer it to xsane and then xsane compress the image
....So we can't use the compressed data from scanner
directly, then the scanner's speed is slow down.
>
> ----- Original Message -----
> From: "René Rebe" <reneexactcode.de>
> To: "zf" <zfan333163.com>
> Cc: "OrgSane-DevelLists. Alioth.
Debian." <sane-devellists.alioth.debian.org>
> Sent: Tuesday, August 22, 2006 5:19 PM
> Subject: (ÈðÐÇÌáÊ¾-´ËÓÊ¼þ¿ÉÄÜÊÇÀ¬»øÓÊ¼þ)Re:
[sane-devel] Image Compression doesn't support in SANE
protocal
>
>
>> On Aug 22, 2006, at 8:10 AM, zf wrote:
>>
>>>  I found no image compression support is added
in SANE. When
>>> scanning with high resolutions such 600 x 600
dpi and uses color
>>> scan, the result image will be very large!
>>>     So many scanners support compress
transfer:scanner compress the
>>> image data and transfer compressed data to
driver. In SANE the
>>> images transfered between backend and frontend
are strict limited.I
>>> think it' better if SANE add some file
transfer type like TWAIN.
>>
>> Most scanners do not support compression anyway.
Such features are
>> only found in 5000 EUR and above devices. If you
just want to save
>> files in a compressed format just use a decent
application such as
>> xsane and not the example programs such as
xscanimage ,-)
>>
>> Yours,
>>

-- 
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what you don't know.
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Image Compression doesn't support in SANE protocal

Thread: Image Compression doesn't support in SANE protocal